Eliminate some dead Fortran configury (these values are not used any
more).

cmr=v1.7.5:reviewer=dgoodell
Thanks to a reminder from Tobias Burunus, commit support for the
upcoming GCC/gfortran 4.9's ignore TKR interface.

This was originally committed in a side mercurial repo, but I sadly
completely forgot about it until Tobias reminded me.

cmr=v1.7.5:reviewer=dgoodell:subject=Add support for gfortran 4.9 Fortran ignore TKR
These README edits should have been included in r30152.

Refs #4058
Add first 1.7.5 bullet point about gfortran 4.9 ignore TKR functionality.