travis: move CHECK_INTERNAL check up, remove "SRCDIR=build VERIFY=1" job in favor of "MAKEFLAGS="HAVE_RULES=yes" SRCDIR=build VERIFY=1"

Conflicts:
	.travis.yml
travis: run cppcheck with --exception-handling where it matters
travis: add -O3 -march=native -mtune=native to default CXXFLAGS
Merge pull request #342 from matthiaskrgr/travis_working

Travis working