Fix two pedantic issues with our builtin headers. The __STDC_VERSION__
for C99 is '199901L' and we shouldn't be comparing it with anything
else.

Neither of these should have had any impact in practice.

llvm-svn: 201738
diff --git a/clang/lib/Headers/limits.h b/clang/lib/Headers/limits.h
index 68efbc3..f04187c 100644
--- a/clang/lib/Headers/limits.h
+++ b/clang/lib/Headers/limits.h
@@ -89,7 +89,7 @@
 /* C99 5.2.4.2.1: Added long long.
    C++11 18.3.3.2: same contents as the Standard C Library header <limits.h>.
  */
-#if __STDC_VERSION__ >= 199901 || __cplusplus >= 201103L
+#if __STDC_VERSION__ >= 199901L || __cplusplus >= 201103L
 
 #undef  LLONG_MIN
 #undef  LLONG_MAX