[gimp] build: fix typo s/en_GN/en_GB/

[Jehan <jehanp src gnome org>]

commit 3e1143595e7a3982222c86ca82207e16003c72e4
Author: Jehan <jehan girinstud io>
Date:   Sat Sep 4 01:18:07 2021 +0200

    build: fix typo s/en_GN/en_GB/

 build/windows/installer/lang/Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/build/windows/installer/lang/Makefile.am b/build/windows/installer/lang/Makefile.am
index 98f766436e..6d28beeece 100644
--- a/build/windows/installer/lang/Makefile.am
+++ b/build/windows/installer/lang/Makefile.am
@@ -14,7 +14,7 @@ languages = \
        de:[de]:WINDOWS-1252            \
        el:[el]:WINDOWS-1253            \
        en::WINDOWS-1252                \
-       en_GB:[en_GN]:UTF-8             \
+       en_GB:[en_GB]:UTF-8             \
        eo:[eo]:ISO-8859-3              \
        es:[es]:WINDOWS-1252            \
        eu:[eu]:WINDOWS-1252            \