[Bug fortran/124484] Coarray test error on some older glibc due to missing -lrt

[vehre at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124484

--- Comment #7 from Andre Vehreschild <vehre at gcc dot gnu.org> ---
So, would this then be more the fix:

           if { [istarget *-*-freebsd*] } {
                dg-test $test "-fcoarray=lib -pthread $flags -lcaf_shmem" {}
            } else {
                if { [istarget *-linux*] } {
                    dg-test $test "-fcoarray=lib -pthread -lrt $flags
-lcaf_shmem" {}
                } else {
                    dg-test $test "-fcoarray=lib $flags -lcaf_shmem" {}
                }
            }

I.e. always add -pthread -lrt when running on Linux?