always include stdarg.h

src/std/ucs2.c

@@ -20,9 +20,10 @@
  * DEALINGS IN THE SOFTWARE.
  */
 #include <hl.h>
-#ifndef HL_NATIVE_UCHAR_FUN
 #include <stdarg.h>
 
+#ifndef HL_NATIVE_UCHAR_FUN
+
 #ifdef HL_ANDROID
 #	include <android/log.h>
 #	ifndef HL_ANDROID_LOG_TAG