GhosttyI18n: fix build on freebsd with zig 0.16 (#13485)

src/build/GhosttyI18n.zig

@@ -26,7 +26,7 @@ pub fn init(b: *std.Build, cfg: *const Config) !GhosttyI18n {
         // so we need to remove it from `locale` to have a correct destination string.
         // (/usr/local/share/locale/en_AU/LC_MESSAGES)
         const target_locale = comptime if (builtin.target.os.tag == .freebsd)
-            std.mem.trimRight(u8, locale, ".UTF-8")
+            std.mem.trimEnd(u8, locale, ".UTF-8")
         else
             locale;