package/live555: fix static build with openssl

package/live555: fix static build with openssl

Use pkg-config to retrieve openssl static dependencies such as -lz or
-latomic.

Moreover, don't pass the openssl libraries to LIBS_FOR_LIVEMEDIA_LIB
when linking statically with ar or the build will break on:

/home/fabrice/buildroot/output/per-package/live555/host/bin/arm-linux-ar cr libliveMedia.a  \
	Media.o MediaSource.o FramedSource.o FramedFileSource.o FramedFilter.o ByteStreamFileSource.o ByteStreamMultiFileSource.o ByteStreamMemoryBufferSource.o BasicUDPSource.o DeviceSource.o AudioInputDevice.o WAVAudioFileSource.o MPEG1or2Demux.o MPEG1or2DemuxedElementaryStream.o MPEGVideoStreamFramer.o MPEG1or2VideoStreamFramer.o MPEG1or2VideoStreamDiscreteFramer.o MPEG4VideoStreamFramer.o MPEG4VideoStreamDiscreteFramer.o H264or5VideoStreamFramer.o H264or5VideoStreamDiscreteFramer.o H264VideoStreamFramer.o H264VideoStreamDiscreteFramer.o H265VideoStreamFramer.o H265VideoStreamDiscreteFramer.o MPEGVideoStreamParser.o MPEG1or2AudioStreamFramer.o MPEG1or2AudioRTPSource.o MPEG4LATMAudioRTPSource.o MPEG4ESVideoRTPSource.o MPEG4GenericRTPSource.o MP3FileSource.o MP3Transcoder.o MP3ADU.o MP3ADUdescriptor.o MP3ADUinterleaving.o MP3ADUTranscoder.o MP3StreamState.o MP3Internals.o MP3InternalsHuffman.o MP3InternalsHuffmanTable.o MP3ADURTPSource.o MPEG1or2VideoRTPSource.o MPEG2TransportStrea
 mMultiplexor.o MPEG2TransportStreamFromPESSource.o MPEG2TransportStreamFromESSource.o MPEG2TransportStreamFramer.o MPEG2TransportStreamAccumulator.o ADTSAudioFileSource.o ADTSAudioStreamDiscreteFramer.o JPEGVideoSource.o JPEGVideoRTPSource.o JPEG2000VideoRTPSource.o H263plusVideoRTPSource.o H263plusVideoStreamFramer.o H263plusVideoStreamParser.o AC3AudioStreamFramer.o AC3AudioRTPSource.o DVVideoStreamFramer.o DVVideoRTPSource.o AMRAudioSource.o AMRAudioFileSource.o InputFile.o StreamReplicator.o MediaSink.o FileSink.o BasicUDPSink.o AMRAudioFileSink.o H264or5VideoFileSink.o H264VideoFileSink.o H265VideoFileSink.o OggFileSink.o MPEG1or2AudioRTPSink.o MP3ADURTPSink.o MPEG1or2VideoRTPSink.o MPEG4LATMAudioRTPSink.o MPEG4GenericRTPSink.o MPEG4ESVideoRTPSink.o JPEGVideoRTPSink.o JPEG2000VideoRTPSink.o H263plusVideoRTPSink.o H264or5VideoRTPSink.o H264VideoRTPSink.o H265VideoRTPSink.o DVVideoRTPSink.o AC3AudioRTPSink.o VorbisAudioRTPSink.o TheoraVideoRTPSink.o VP8VideoRTPSink.o VP9V
 ideoRTPSink.o GSMAudioRTPSink.o SimpleRTPSink.o AMRAudioRTPSink.o T140TextRTPSink.o OutputFile.o RawVideoRTPSink.o uLawAudioFilter.o RTPSource.o MultiFramedRTPSource.o SimpleRTPSource.o H261VideoRTPSource.o H264VideoRTPSource.o H265VideoRTPSource.o QCELPAudioRTPSource.o AMRAudioRTPSource.o VorbisAudioRTPSource.o TheoraVideoRTPSource.o VP8VideoRTPSource.o VP9VideoRTPSource.o RawVideoRTPSource.o RTPSink.o MultiFramedRTPSink.o AudioRTPSink.o VideoRTPSink.o TextRTPSink.o RTPInterface.o RTCP.o rtcp_from_spec.o GenericMediaServer.o RTSPServer.o RTSPServerRegister.o RTSPClient.o RTSPCommon.o RTSPRegisterSender.o SIPClient.o MediaSession.o ServerMediaSession.o PassiveServerMediaSubsession.o OnDemandServerMediaSubsession.o FileServerMediaSubsession.o MPEG4VideoFileServerMediaSubsession.o H264VideoFileServerMediaSubsession.o H265VideoFileServerMediaSubsession.o H263plusVideoFileServerMediaSubsession.o WAVAudioFileServerMediaSubsession.o AMRAudioFileServerMediaSubsession.o MP3AudioFile
 ServerMediaSubsession.o MPEG1or2VideoFileServerMediaSubsession.o MPEG1or2FileServerDemux.o MPEG1or2DemuxedServerMediaSubsession.o MPEG2TransportFileServerMediaSubsession.o ADTSAudioFileServerMediaSubsession.o DVVideoFileServerMediaSubsession.o AC3AudioFileServerMediaSubsession.o MPEG2TransportUDPServerMediaSubsession.o ProxyServerMediaSession.o QuickTimeFileSink.o QuickTimeGenericRTPSource.o AVIFileSink.o MPEG2IndexFromTransportStream.o MPEG2TransportStreamIndexFile.o MPEG2TransportStreamTrickModeFilter.o MatroskaFile.o MatroskaFileParser.o EBMLNumber.o MatroskaDemuxedTrack.o MatroskaFileServerDemux.o MatroskaFileServerMediaSubsession.o MP3AudioMatroskaFileServerMediaSubsession.o OggFile.o OggFileParser.o OggDemuxedTrack.o OggFileServerDemux.o OggFileServerMediaSubsession.o MPEG2TransportStreamDemux.o MPEG2TransportStreamDemuxedTrack.o MPEG2TransportStreamParser.o MPEG2TransportStreamParser_PAT.o MPEG2TransportStreamParser_PMT.o MPEG2TransportStreamParser_STREAM.o HLSSegment
 er.o TLSState.o MIKEY.o SRTPCryptographicContext.o HMAC_SHA1.o BitVector.o StreamParser.o DigestAuthentication.o ourMD5.o Base64.o Locale.o -L/home/fabrice/buildroot/output/per-package/live555/host/bin/../arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib -lssl -L/home/fabrice/buildroot/output/per-package/live555/host/bin/../arm-buildroot-linux-uclibcgnueabi/sysroot/usr/lib -lz -latomic -lpthread -lcrypto -lz -latomic -lpthread
/home/fabrice/buildroot/output/per-package/live555/host/bin/arm-linux-ar: invalid option -- 'L'

Fixes:
 - http://autobuild.buildroot.org/results/1299a05cfaabccc45e2878e969b443a973ec4c9e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Michael Nosthoff<buildroot@heine.tech>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>