Disable memdebug for the allocs done by the app, unless CURLTOOLDEBUG is

defined (which it never is atm).

Now, we can focus on making 'runtests -t [num]' work on all test cases and
we should never leak nor crash.

src/main.c

@@ -107,6 +107,9 @@
 
 /* The last #include file should be: */
 #ifdef CURLDEBUG
+#ifndef CURLTOOLDEBUG
+#define MEMDEBUG_NODEFINES
+#endif
 /* This is low-level hard-hacking memory leak tracking and similar. Using
    the library level code from this client-side is ugly, but we do this
    anyway for convenience. */