package/librtlsdr: bump to more recent upstream master version

package/librtlsdr: bump to more recent upstream master version

Since 948666dfde1e0a5d149442f80facc162a83016ad, librtlsdr in Buildroot is no longer
built from an official release, but from a commit on the master branch. However, the
commit that was referenced has a broken pkgconfig file templating, such that
other packages using `pkgconfig --libs librtlsdr` as part of their build process
(such as dump1090) could not be built anymore:

Before 948666dfde1e0a5d149442f80facc162a83016ad:
$ cat staging/usr/lib/pkgconfig/librtlsdr.pc
prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: RTL-SDR Library
Description: C Utility Library
Version: 0.6.0
Cflags: -I${includedir}/
Libs: -L${libdir} -lrtlsdr -lusb-1.0
Libs.private:

On 948666dfde1e0a5d149442f80facc162a83016ad:
$ cat staging/usr/lib/pkgconfig/librtlsdr.pc
prefix=
exec_prefix=
libdir=
includedir=

Name: RTL-SDR Library
Description: C Utility Library
Version: 7082
Cflags: -I${includedir}/
Libs: -L${libdir} -lrtlsdr
Libs.private:  -lusb-1.0

In the meantime, upstream released a bugfix for that ([1]), so we bump to that
commit as well, and update the only patch for shared libs accordingly, because
upstream also added a new tool called `rtl_biast` in the meantime.

Finaly, we update the hash file to the two-spaces convention.

Fixes: http://autobuild.buildroot.net/results/b4c/b4cdcb59cc61c51c024197a64865ad4b60023d0c/
[1]: https://github.com/steve-m/librtlsdr/commit/ed0317e6a58c098874ac58b769cf2e609c18d9a5

Signed-off-by: Titouan Christophe <titouan.christophe@railnova.eu>
Tested-by: Heiko Thiery <heiko.thiery@gmail.com>
Tested-by: Gwenhael Goavec-Merou <gwenhael.goavec-merou@trabucayre.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>