POPPLER_CREATE_INSTALL_PKGCONFIG (cmake/modules/PopplerMacros.cmake) does not install *.pc files

If I build poppler with MSVC (or clang with MSVC compatibility) *.pc are not installed because of condition in cmake/modules/PopplerMacros.cmake

IMO this is not correct approach:

pc file has nothing to do with compiler
if somebody want to limit installation of pc file, it should be related to presence of pkg_config (PKG_CONFIG_EXECUTABLE). In such case I would suggest to at least print message that pc files will not be installed.

Personally I would install pc files always as user can install pkg_config later so there is no need to reinstall poppler.

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