/sys/src/cmd/mkfile: infer list of compilers
 [rsc] --rw-rw-r-- M 951118 glenda sys 2451 Mar 21 11:35 sys/src/cmd/mkfile
	/n/sourcesdump/2006/0321/plan9/sys/src/cmd/mkfile:8,14 - 
	/n/sourcesdump/2006/0322/plan9/sys/src/cmd/mkfile:8,14
	  YFLAGS=-d
	  
	  NOTSYS=sml|dup
	- BUGGERED=gc|lmlvideo|dwb|unix|perl|celp|mosml|ovac|vfs|aviation|_vnc|postscript
	+ BUGGERED=gc|lmlvideo|dwb|unix|perl|celp|mosml|ovac|vfs|aviation|_vnc|postscript|nventi|cvsold|cvs
	  OUTOFDATE=old|ssls
	  
	  NOMK=$NOTSYS|$BUGGERED|$OUTOFDATE
	/n/sourcesdump/2006/0321/plan9/sys/src/cmd/mkfile:116,126 - 
	/n/sourcesdump/2006/0322/plan9/sys/src/cmd/mkfile:116,129
	  compilers:V:
	  	@{
	  		cd cc
	+ 		mk clean
	  		mk installall
	  		mk clean
	  	}
	- 	for(i in 1c 2c 5c 7c 8c kc qc vc) @{
	+ 	for(i in ?c)
	+ 	if(! ~ $i cc rc) @{
	  		cd $i;
	+ 		mk clean
	  		mk installall
	  		mk clean
	  	}