Warn if KDEGitCommitHooks is used together with a custom hooksPath.

Johannes Zarl-Zierl requested to merge work/jzarl/gitcommithooks-gitconfig into master

When the git config core.hooksPath is set to a a value different from .git/hooks, the hooks installed with KDEGitCommitHooks are ignored. This commit adds a warning message in this case.

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