Fix Linux build.

Change-Id: Ifa2239e897cfa8878a43ce6e51ab731f2b67b7b1
Reviewed-on: https://swiftshader-review.googlesource.com/15288
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/OpenGL/compiler/preprocessor/Input.h b/src/OpenGL/compiler/preprocessor/Input.h
index dd85f4a..59083bf 100644
--- a/src/OpenGL/compiler/preprocessor/Input.h
+++ b/src/OpenGL/compiler/preprocessor/Input.h
@@ -17,6 +17,7 @@
 
 #include <cstddef>
 #include <vector>
+#include <climits>
 
 namespace pp
 {