Prefer bash-completion directory from pkg-config #247
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...with backwards compatibility for pkg-config < 0.28
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As of writing, the bash-completion configuration is installed in the
$(sysconfdir)/bash_completion.d/directory, while downstreams, such as Linux distributions, might prefer/usr/share/bash-completion/completions/(or even another path). For this, the pkg-config configuration file from bash-completion provides a variable being leveraged here (with fallback to the current directory).To avoid breaking old Linux distributions with pkg-config < 0.28, some autoconf code for backwards compatibility is added, too.