Bug 560969: Teach trace-malloc about VC10. r=dbaron

tools/trace-malloc/lib/nsWinTraceMalloc.cpp

@@ -62,6 +62,8 @@
 #define NS_DEBUG_CRT "msvcr80d.dll"
 #elif _MSC_VER == 1500
 #define NS_DEBUG_CRT "msvcr90d.dll"
+#elif _MSC_VER == 1600
+#define NS_DEBUG_CRT "msvcr100d.dll"
 #else
 #error "Don't know filename of MSVC debug library."
 #endif