Resolve Crosscompilation (GNU/Linux): Set reset (cmake bug?) environment variables for pkg_config again.HEADmaster

Setting environment variables PKG_CONFIG_LIBDIR, PKG_CONFIG_PATH and PKG_CONFIG_SYSROOT_DIR
for proper pkg_config crosscompilation within CMAKE_TOOLCHAIN_FILE wasn't successful
as they were reset during cmake execution.

Workaround is to have CMAKE_TOOLCHAIN_FILE set cached cmake variable's w/ same name
and have the environment variables set again from within CMakeLists.

I have left verbose debugging code marked w/ 'jau' for clarify and potential solution later on.

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