(ci) Still fixing clang-10 on Travis-CI
(ci) Still fixing clang-10 on Travis-CI

Multi-line if statement doesn't work, so use single ones. Also don't skip before_install on gitcheck and clang-format now that package installation is using before_install.

acgetchell/CDT-plusplus,acgetchell/CDT-plusplus,acgetchell/CDT-plusplus