the build machines, which breaks many more important ports.
Switch dtools to build with dmd. This allows us to continue to offer the
package on at least amd64.
Comment out the gdmd line in lang/Makefile to make it clear this is
intentional. We will revisit gdmd once the ports world moves to gcc-11.
Found the hard way by tb@ -- apologies for the breakage
ok sthen@, who also mentioned the commenting out of gdmd in lang/Makefile
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