Pull request #664: CAS-14019
Merge in CASA/casa6 from CAS-14019 to master
* commit 'bea30e4513d77c22b1743572e36467bf2e791e40':
allow for cleanup of compile flags for ccache (macos) + improve libgfortran finding [CAS-14019]
changes to allow casatools to compile w/ gcc12 on macos [CAS-14019]