[git] Install gitk on Mac

I had the same problem on Mac 10.7.5 with git version 1.7.12.4

When I ran gitk I got an error:

"Error in startup script: expected version number but got "Git-37)"
    while executing
"package vcompare $git_version "1.6.6.2""
    invoked from within
"if {[package vcompare $git_version "1.6.6.2"] >= 0} {
    set show_notes "--show-notes"
}"
    (file "/usr/bin/gitk" line 11587)

When I looked at the code in gitk I saw the line that sets the version.

set git_version [join [lrange [split [lindex [exec git version] end] .] 0 2] .]

This somehow parsed the git version results to Git-37 instead of 1.7.12.4

I just replaced the git_version line with:

set git_version "1.7.12.4"

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