Remove explicit detection of pkg-config
Remove explicit detection of pkg-config

It is not actually used, and even if it was, PKG_CHECK_MODULES already does
the detection, and with support for cross-compilation, so we should not try
to detect pkg-config by hand, it only reduces support.

liblouis/liblouis,liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,hammera/liblouis,liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,BueVest/liblouis,liblouis/liblouis,BueVest/liblouis,liblouis/liblouis,hammera/liblouis,hammera/liblouis,liblouis/liblouis,hammera/liblouis