Backport new-style 'PKG_PROG_PKG_CONFIG' macro from pkg-config 0.29.2. #199
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Since the definition of this macro has been changed to error-out if a new introduced second parameter is ommited and the pkg-conf executable is not found on the system, the configure script from the release tarballs will fail in certain minimal bootstrap environments, that do not include a pkg-config executable (or the provided version is too old).
The backport of a compatibility is needed to be able to regenerate the build-system on older systems, which do not offer a variant of the macro definition with an optional second parameter.
Fixes #198.