patch 8.2.0140: CI does not test building doc tags

Problem:    CI does not test building doc tags.
Solution:   Add the vimtags/gcc build. Cleanup showing version. (Ozaki Kiichi,
            closes #5513)

ci/if_ver-2.vim

@@ -0,0 +1,8 @@
+" Print py3 interface versions for Ubuntu. Part 2.
+
+if 1
+  execute 'source' expand('<sfile>:h') .. '/if_ver-cmd.vim'
+
+  echo 'Python 3:'
+  PrintVer python3 print(sys.version)
+endif