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-1.vim

@@ -0,0 +1,25 @@
+" Print all interface versions for Ubuntu. Part 1.
+
+if 1
+  execute 'source' expand('<sfile>:h') .. '/if_ver-cmd.vim'
+
+  echo "*** Interface versions ***\n"
+
+  echo 'Lua:'
+  PrintVer lua print(_VERSION)
+
+  echo 'MzScheme:'
+  PrintVer mzscheme (display (version))
+
+  echo 'Perl:'
+  PrintVer perl print $^V
+
+  echo 'Ruby:'
+  PrintVer ruby print RUBY_VERSION
+
+  echo 'Tcl:'
+  PrintVer tcl puts [info patchlevel]
+
+  echo 'Python 2:'
+  PrintVer python print sys.version
+endif