[cflags] Removed -Wno-pointer-sign

Likely some new bugs were introduced by this change.
The long term goal is clean compilation by g++.

src/intl/gettext/gettext.c

@@ -30,8 +30,8 @@
 /* Look up MSGID in the current default message catalog for the current
    LC_MESSAGES locale.  If not found, returns MSGID itself (the default
    text).  */
-unsigned char *
-gettext__(const unsigned char *msgid)
+char *
+gettext__(const char *msgid)
 {
 	return dcgettext__(NULL, msgid, LC_MESSAGES);
 }