git: do not overwrite system-wide gitconfig, when adding configuration for the osxkeychain credential helper #13259
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Do not overwrite the system-wide gitconfig when adding configuration for the osxkeychain credential helper
If the gitconfig does not exist, then it will be created. But if it does
exist, then the file will be checked to see whether it already contains the
desired config, and if it doesn't, the configuration will be appended to the
already existing file.
Fixes: https://trac.macports.org/ticket/63953
Verification
Have you
port lint
?sudo port test
?sudo port -d install
?