fix: dump build works again
improve: typed env vars
add: compilers have a name
temporary: link_flags and force architecture flags
fix: remove glu in opengl libs
improve: shared libraries is influenced by env vars
fix: compiler saved per build
Merge branch 'master' of github.com:hotgloupi/tupcfg

Conflicts:
	src/tupcfg/lang/c/library.py