[Buildroot] [PATCH] package/shairport-sync: add upstream patch to fix build issue with soxr

[Peter Korsgaard]

>>>>> "Jörg" == Jörg Krause <joerg.krause at embedded.rocks> writes:

 > Add upstream patch to fix build issue detected by the Buildroot autobuilder:
 > ```
 > arm-buildroot-linux-uclibcgnueabi/sysroot/usr//lib/libsoxr.a(soxr.c.o): In function `soxr_create':
 > soxr.c:(.text+0xd4c): undefined reference to `av_get_cpu_flags'
 > collect2: error: ld returned 1 exit status
 > ```

 > A quick look at the soxr source code shows that `soxr_create()` might use
 > `av_get_cpu_flags()` depending on the architecture.

 > For the sake of simplicity link with `-lavutil` if it is found when using soxr.

 > Even better, as soxr provides a pkg-config file, this should be prefered.

 > Upstream issue: https://github.com/mikebrady/shairport-sync/issues/733
 > Upstream status: 5101ab2d13e2b89ea3c1276df5fb7413634eeccd

 > Fixes:
 > http://autobuild.buildroot.net/results/53d/53d21686780aa2485745b59e812b6280dd39f1c5
 > http://autobuild.buildroot.net/results/605/60576363adfca404c3a7883d5d46e8a4a9ee8171
 > http://autobuild.buildroot.net/results/806/806867ab1c6f42ad1b34d44844efc57272d48235
 > http://autobuild.buildroot.net/results/840/840810601fbb8a7957ea9dae175b959a7f9b7491
 > .. and more.

 > Signed-off-by: Jörg Krause <joerg.krause at embedded.rocks>

Committed to 2018.02.x and 2018.05.x (even though they use
shairport-sync 3.1.6), thanks.

-- 
Bye, Peter Korsgaard