travis: suppressions: remove some suppressions of false positives that are no longer necessary.
#5782 Endless recursion in CheckClass::checkReturnPtrThis(). Break endless recursion by remembering the callstack
#5782 Endless recursion in CheckClass::checkReturnPtrThis(). Break endless recursion by remembering the callstack (missing header file)
Merge branch 'master' into travis_advanced
Some cleanup for CppcheckSignalHandler, also some cosmetics for the output
Merge pull request #304 from matthiaskrgr/travis

travis: suppressions: remove some suppressions of false positives that are no longer necessary.
Merge branch 'master' into travis_advanced