Workaround gcc -Wformat -Wformat-extra-args warnings

The MinGW build of gcc doesn't handle %zu and gives warnings:

DOH/memory.c: In function 'allocation_failed':
DOH/memory.c:262:42: warning: unknown conversion type character 'z' in format [-Wformat=]
  262 |     fprintf(stderr, "Failed to allocate %zu bytes\n", size);
      |                                          ^
DOH/memory.c:262:21: warning: too many arguments for format [-Wformat-extra-args]
  262 |     fprintf(stderr, "Failed to allocate %zu bytes\n", size);
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Just casting to unsigned long seems good enough for a failure message
where the value is unlikely to be truncated and the actual value reported
is not particularly significant.

Author: wsfulton

Source/DOH/memory.c

@@ -258,17 +258,9 @@ static void allocation_failed(size_t n, size_t size) {
   /* Report and exit as directly as possible to try to avoid further issues due
    * to lack of memory. */
   if (n == 1) {
-#if defined __STDC_VERSION__ && __STDC_VERSION__-0 >= 199901L
-    fprintf(stderr, "Failed to allocate %zu bytes\n", size);
-#else
     fprintf(stderr, "Failed to allocate %lu bytes\n", (unsigned long)size);
-#endif
   } else {
-#if defined __STDC_VERSION__ && __STDC_VERSION__-0 >= 199901L
-    fprintf(stderr, "Failed to allocate %zu*%zu bytes\n", n, size);
-#else
     fprintf(stderr, "Failed to allocate %lu*%lu bytes\n", (unsigned long)n, (unsigned long)size);
-#endif
   }
   DohExit(EXIT_FAILURE);
 }