pulseaudio: fix build issue with old gcc versions

This commit adds a patch to pulseaudio (already submitted upstream)
that avoids a structure redefinition build failure that occurs with
old gcc versions.

Fixes:

  http://autobuild.buildroot.org/results/a1e/a1e7e59f9c65a6ce38800439c78b7808048ad708/



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>