Prefix to fix conflicts with emacs and update

[dereks_lifeofadishwasher.com]

Summary

• Add --program-prefix=u to fix conflicts with emacs' ctags
• Update to ccac4dff g20171017

Test Plan

• testport, buld, install, test
• build tag file with uctags and used file inside vim

[lwhsu]

I think this can be closed since it is overcome by https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223076

[dereks_lifeofadishwasher.com]

Yes, I agree.

[lwhsu]

so please do so :-) only the author can do this, or others need to "commandeer revision" at first.