No bug, add missing include to StackWalk.cpp, DONTBUILD

mozglue/misc/StackWalk.cpp

@@ -11,6 +11,8 @@
 #include "mozilla/IntegerPrintfMacros.h"
 #include "mozilla/StackWalk.h"
 
+#include <string.h>
+
 #if defined(_MSC_VER) && _MSC_VER < 1900
 #define snprintf _snprintf
 #endif