#2 Fix for automake using relative path with fortran

[kwizart]

There is some weird issue with the fortran sources when debuginfo are extracted. This seem to be created because of the use of relative path within the Makefile.am.

The original problem might be in automake; nevertheless, until the problem is sorted, an acceptable workaround would be to avoid the use of relative pathes within Makefile.am most of the time.

The side effect is not applied will be to have debug information missing from a rpm debuginfo package.

See https://bugzilla.redhat.com/show_bug.cgi?id=466737

PS: please note that Makefile.in aren't expected to be available in source code repository, so I haven't attached it.

[kwizart]

fix the source file path so they can get found at debuginfo stage