Fix pkgconf file: escaping needed
Due to the various processors going over the command, we need more
escaping.
1) Make parses it, so $${libdir} becomes ${libdir}
2) 'shell' parses it for the 'echo command', whereas echo ${libdir}
would be an empty string; escape it as \${libdir} to ensure we get what
we want.
Closes #312
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