Revert "alsa-utils: amidi option needs seq support in alsa-lib"

Revert "alsa-utils: amidi option needs seq support in alsa-lib"

This reverts commit c69088b8c35177cecdd0f1f385c13f5b2c509f1d, which is
no longer needed now that alsa-lib has been fixed properly.

Indeed, this commit was made because alsa-utils failed to build with:

/home/buildroot/build/instance-0/output/host/usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libasound.a(pcm_dmix.o): In function `snd_pcm_dmix_htimestamp':
pcm_dmix.c:(.text+0x5c0): warning:
/home/buildroot/build/instance-0/output/host/usr/xtensa-buildroot-linux-uclibc/sysroot/usr/lib/libasound.a(rawmidi_symbols.o):(.data.rel+0x4): undefined reference to `_snd_module_rawmidi_virt'
collect2: error: ld returned 1 exit status

Which is exactly the problem that we fixed in alsa-lib by making sure
that rawmidi_symbols.c doesn't reference symbols from rawmidi_virt.c
when SEQ support is not enabled.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>