link gettext properly for git when gettext does not provide libintl (#21472)

var/spack/repos/builtin/packages/git/package.py

@@ -253,6 +253,7 @@ def setup_build_environment(self, env):
         # In that case the node in the DAG gets truncated and git DOES NOT
         # have a gettext dependency.
         if 'gettext' in self.spec:
+            if 'intl' in self.spec['gettext'].libs.names:
                 env.append_flags('EXTLIBS', '-L{0} -lintl'.format(
                     self.spec['gettext'].prefix.lib))
             env.append_flags('CFLAGS', '-I{0}'.format(