Revert "dev-ml/lacaml: Use tc-getPKG_CONFIG from toolchain-funcs.eclass instead of plain pkg-config"

This reverts commit feee3be41866e292a945d0494f9329dad2f43998.
Revert "Merge branch 'jlec' of github.com:gentoo-science/sci"

This reverts commit 62f75f52e03c91a82271472f90ef9febcc60bad1, reversing
changes made to feee3be41866e292a945d0494f9329dad2f43998.