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mkfile: fix non-existent file used for builtins generation; remove generated files on errors

--- a/mkfile

+++ b/mkfile

@@ -46,14 +46,15 @@

 </sys/src/cmd/mkone

-plan9/builtin_fns.h:

-	sed -n 's/^BUILTIN[_]?(\(".*)/BUILTIN_FN\1/gp' `{echo $OFILES | sed 's/\.'$O'/.c/g'} | sort >$target

+plan9/builtin_fns.h:D:

+	sed -n 's/^BUILTIN[_]?(\(".*)/BUILTIN_FN\1/gp' \

+		`{ls `{echo $OFILES | sed 's/\.'$O'/.c/g'} >[2]/dev/null} | sort >$target

 main_plan9.$O: plan9/builtin_fns.h

 flisp.$O: maxstack.inc opcodes.h plan9/builtin_fns.h

 builtins.$O: plan9/builtin_fns.h

-plan9/flisp.boot.s: flisp.boot

+plan9/flisp.boot.s:D: flisp.boot

 	aux/data2s boot <flisp.boot >$target

 flisp.boot.$O: plan9/flisp.boot.s