[cmake] pass C and C++ compilers down to external projects
[cmake] pass C and C++ compilers down to external projects

sunqm/pyscf,gkc1000/pyscf,sunqm/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf