Fix compiler warning

This cast is already done for all other _aliases, but this one has
apparently been missed so far.

Author: cmb69

ext/mbstring/libmbfl/filters/mbfilter_iso2022jp_mobile.c

@@ -48,7 +48,7 @@ const mbfl_encoding mbfl_encoding_2022jp_kddi = {
 	mbfl_no_encoding_2022jp_kddi,
 	"ISO-2022-JP-MOBILE#KDDI",
 	"ISO-2022-JP",
-	&mbfl_encoding_2022jp_kddi_aliases,
+	(const char *(*)[])&mbfl_encoding_2022jp_kddi_aliases,
 	NULL,
 	MBFL_ENCTYPE_MBCS | MBFL_ENCTYPE_SHFTCODE | MBFL_ENCTYPE_GL_UNSAFE,
 	&vtbl_2022jp_kddi_wchar,