Use std=legacy with gfortran
Use std=legacy with gfortran

- This preserves backwards compatability.
- -fallow-argument-mismatch is only supported starting
  with gfortran 10.1.
- Fixes #1218

Change-Id: I7adf63114a3a0d298cc77d9b2bd208532e8d200d
Signed-off-by: Brad Geltz <e42f3ad4099980ea02f08e076efbee5cf9d4a803@intel.com>

cmcantalupo/geopm,geopm/geopm,geopm/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm,cmcantalupo/geopm,cmcantalupo/geopm,geopm/geopm