<limits.h> includes <linux/limits.h> on Linux, no need to special-case it


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173578 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Lex/HeaderSearch.cpp b/lib/Lex/HeaderSearch.cpp
index 6432925..3bf38e0 100644
--- a/lib/Lex/HeaderSearch.cpp
+++ b/lib/Lex/HeaderSearch.cpp
@@ -24,9 +24,7 @@
 #include "llvm/Support/Path.h"
 #include <cstdio>
 #if defined(LLVM_ON_UNIX)
-#if defined(__linux__)
-#include <linux/limits.h>
-#endif
+#include <limits.h>
 #endif
 using namespace clang;