Add missing <stdint.h> to build properly on Solaris.  Patch by Joakim Johansson

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@123006 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/int_lib.h b/lib/int_lib.h
index f079756..e1fd6b7 100644
--- a/lib/int_lib.h
+++ b/lib/int_lib.h
@@ -20,6 +20,7 @@
 /* Assumption:  right shift of signed negative is arithmetic shift */
 
 #include <limits.h>
+#include <stdint.h>
 #include "endianness.h"
 #include <math.h>