Description: The Fortran compiler flags were all set to "-O". They should be
different setting for different situations. E.g, "-g" for debug and
"-pg" for profile, etc.

Fix: set them to appropriate different values.

Tested: in Remote ADA AIX machines using 3 different settings:
    configure --enable-fortran --enable-cxx     # default to --disable-production
    configure --enable-fortran --enable-cxx --enable-production
    configure --enable-fortran --enable-cxx --disable-production