modern objc translator: string.h is unavailable on some non-OSX

platforms declare memset in rewritten code instead.

llvm-svn: 159454

clang/lib/Rewrite/RewriteModernObjC.cpp

@@ -5958,7 +5958,7 @@ void RewriteModernObjC::Initialize(ASTContext &context) {
   }
   
   // needed for use of memset.
-  Preamble += "\n#include <string.h>\n";
+  Preamble += "\nextern \"C\" void * memset(void *b, int c, unsigned long len);\n";
   
   // Declarations required for modern objective-c array and dictionary literals.
   Preamble += "\n#include <stdarg.h>\n";