sys/types.h is required for the u_int_XX types used by pcm.h.
since a change in pcm.h is not desired, we add the inclusion
to the header that includes pcm.h during build.
Signed-off-by: John Spencer <maillist-alsa@barfooze.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>