Added missing includes for building with glibc2.17-6 (on Arch Linux)

lib/Core/KleeHandler.cpp

@@ -23,6 +23,7 @@
 
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <unistd.h>
 #include <dirent.h>
 
 // FIXME

runtime/POSIX/stubs.c

@@ -18,6 +18,7 @@
 #include <limits.h>
 #include <stdlib.h>
 #include <sys/mman.h>
+#include <sys/resource.h>
 #include <sys/times.h>
 #include <sys/types.h>
 #include <sys/wait.h>