fix: use compliant vasprintf on mingw32 environments in json-c

lib/external/json-c/vasprintf_compat.h

@@ -14,53 +14,53 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#if !defined(HAVE_VASPRINTF)
+#if defined(__MINGW32__) || !defined(HAVE_VASPRINTF)
 /* CAW: compliant version of vasprintf */
 static int vasprintf(char **buf, const char *fmt, va_list ap)
 {
 #ifndef WIN32
-	static char _T_emptybuffer = '\0';
-	va_list ap2;
+  static char _T_emptybuffer = '\0';
+  va_list ap2;
 #endif /* !defined(WIN32) */
-	int chars;
-	char *b;
+  int chars;
+  char *b;
 
-	if (!buf)
-	{
-		return -1;
-	}
+  if (!buf)
+  {
+    return -1;
+  }
 
 #ifdef WIN32
-	chars = _vscprintf(fmt, ap);
+  chars = _vscprintf(fmt, ap);
 #else  /* !defined(WIN32) */
-	/* CAW: RAWR! We have to hope to god here that vsnprintf doesn't overwrite
+  /* CAW: RAWR! We have to hope to god here that vsnprintf doesn't overwrite
 	 * our buffer like on some 64bit sun systems... but hey, it's time to move on
-	 */
-	va_copy(ap2, ap);
-	chars = vsnprintf(&_T_emptybuffer, 0, fmt, ap2);
-	va_end(ap2);
+   */
+  va_copy(ap2, ap);
+  chars = vsnprintf(&_T_emptybuffer, 0, fmt, ap2);
+  va_end(ap2);
 #endif /* defined(WIN32) */
-	if (chars < 0 || (size_t)chars + 1 > SIZE_MAX / sizeof(char))
-	{
-		return -1;
-	}
+  if (chars < 0 || (size_t)chars + 1 > SIZE_MAX / sizeof(char))
+  {
+    return -1;
+  }
 
-	b = (char *)malloc(sizeof(char) * ((size_t)chars + 1));
-	if (!b)
-	{
-		return -1;
-	}
+  b = (char *)malloc(sizeof(char) * ((size_t)chars + 1));
+  if (!b)
+  {
+    return -1;
+  }
 
-	if ((chars = vsprintf(b, fmt, ap)) < 0)
-	{
-		free(b);
-	}
-	else
-	{
-		*buf = b;
-	}
+  if ((chars = vsprintf(b, fmt, ap)) < 0)
+  {
+    free(b);
+  }
+  else
+  {
+    *buf = b;
+  }
 
-	return chars;
+  return chars;
 }
 #endif /* !HAVE_VASPRINTF */