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pipewire_0_2: add -fcommon workaround
Without the change build fails as:
$ nix build --impure --expr 'with import ./. {}; pipewire_0_2.override { stdenv = clang12Stdenv; }' -L
...
ld: spa/plugins/bluez5/libspa-bluez5.so.p/bluez5-monitor.c.o:(.bss+0x0):
multiple definition of `spa_a2dp_sink_factory'
Newer versions don't require the fix as upstream removed the code completely later.