macro: Move PA_LIKELY()/PA_UNLIKELY(), PA_CLAMP()/PA_CLAMP_UNLIKELY() to pulse/gccmacro.h
PA_CLAMP_VOLUME() in pulse/volume.h makes use of PA_CLAMP_UNLIKELY()
see https://bugs.freedesktop.org/show_bug.cgi?id=89515
Signed-off-by: Peter Meerwald pmeerw@pmeerw.net