oprofile: fix nanosleep() issue on non-threaded toolchains

This commit adds a patch to OProfile that ensures <time.h> is included
whenever nanosleep() is used, which fixes a build failure on uClibc
toolchains with no thread support.

Fixes:

  http://autobuild.buildroot.org/results/d28/d28447c1241ce3dd237710e388d799139d7d613d/



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