patch 9.1.0712: tests: missing dependency of Test_gettext_makefile

Problem:  tests: missing dependency of Test_gettext_makefile
Solution: Check that xgettext binary is available, else skip the test
          (James McCoy)

closes: #15612

Signed-off-by: James McCoy <jamessan@jamessan.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_gettext_make.vim

@@ -18,6 +18,7 @@ func Test_gettext_makefile()
           \ ..\testdir\test_gettext_makefile_in4.vim" test_gettext.pot')
   else
 " Will it work on macOS?
+    CheckExecutable xgettext
     call system("make -f Makefile PLUGPACKAGE=test_gettext
           \ PO_PLUG_INPUTLIST=\"../testdir/test_gettext_makefile_in1.vim
           \ ../testdir/test_gettext_makefile_in2.vim

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    712,
 /**/
     711,
 /**/