community/aircrack-ng: fix build by disabling -fno-common

There is currently no upstream fix for this issue so disable -fno-common
for now by passing -fcommon to the flags.

/usr/lib/gcc/powerpc64le-alpine-linux-musl/10.2.1/../../../../powerpc64le-alpine-linux-musl/bin/ld: ./.libs/libradiotap.a(radiotap.o):(.bss+0x0): multiple definition of `__packed'; lib/osdep/.libs
7 jobs for !16079 with aircrack-ng in 6 seconds (queued for 4 seconds)
merge request