broken build under some versions of gcc

[Zombie-Ryushu]

-lpthread
src/libretro-common/rthreads/rthreads.o: In function scond_wait_timeout': rthreads.c:(.text+0x265): undefined reference to clock_gettime'
src/libretro-common/features/features_cpu.o: In function cpu_features_get_perf_counter': features_cpu.c:(.text+0x20): undefined reference to clock_gettime'
src/libretro-common/features/features_cpu.o: In function cpu_features_get_time_usec': features_cpu.c:(.text+0x60): undefined reference to clock_gettime'
collect2: error: ld returned 1 exit status
gmake: *** [desmume_libretro.so] Error 1
cp "desmume_libretro.so" "/builddir/build/BUILD/libretro-20170303/dist/unix/desmume_libretro.so"
cp: cannot stat 'desmume_libretro.so': No such file or directory

Desmume fails to build on some of my systems with this error.,

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