updated for version 7.4b.016
Problem:    Ruby detection fails on Fedora 19.
Solution:   Use one way to get the Ruby version. (Michael Henry)
Added tag v7-4b-016 for changeset ba37e955913e
updated for version 7.4b.017
Problem:    ":he \^x" gives a strange error message. (glts)
Solution:   Do not translate \^x to \_CTRL-x.
Added tag v7-4b-017 for changeset 8c42772f0543