Overhaul of gcovr's logic for determining gcc/g++'s original working directory.  This resolves issues introduced in the original implementation of `--object-directory` (resolves #3872) and fixes #3883.
Overhaul of gcovr's logic for determining gcc/g++'s original working
directory.  This resolves issues introduced in the original
implementation of `--object-directory` (resolves #3872) and fixes #3883.


git-svn-id: e4f7de28818dff3ab344c7e41b2bfd4f338da35d@2555 c9093e8b-e624-0410-814a-e3c5b6d4c2ac

rpetrich/gcovr,rpetrich/gcovr,rpetrich/gcovr,rpetrich/gcovr