Add a patch for Cairo that ensures <unistd.h> is properly included to
get the prototype of readlink and getppid even on non-MMU platforms.
Fixes:
http://autobuild.buildroot.net/results/93a97f90345d193b52035b2dc7559a306e11098e/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
