Use a different gettext package name from upstream gucharmap.

--- 456fe86c30943c7c735149adcaaf4f12e5acc938/configure.ac	2025-07-11 16:46:42.000000000 +0100
+++ 456fe86c30943c7c735149adcaaf4f12e5acc938/configure.ac	2025-07-11 17:01:55.320105026 +0100
@@ -201,7 +201,7 @@
 # i18n
 # ****
 
-GETTEXT_PACKAGE=gucharmap
+GETTEXT_PACKAGE=gucharmap2
 AC_SUBST([GETTEXT_PACKAGE])
 AC_DEFINE_UNQUOTED([GETTEXT_PACKAGE],["$GETTEXT_PACKAGE"],[The gucharmap gettext domain])
 AM_GLIB_GNU_GETTEXT