Move mkfiles from /etc/mk to /usr/share/mk

Simplifies pkgsrc porting.

share/mk/bsd.subdir.mk

@@ -0,0 +1,49 @@
+#	$NetBSD: bsd.subdir.mk,v 1.50 2009/11/29 16:00:00 uebayasi Exp $
+#	@(#)bsd.subdir.mk	8.1 (Berkeley) 6/8/93
+
+.include <bsd.init.mk>
+
+# MINIX: cleandepend works for SUBDIRs
+TARGETS+= cleandepend
+.PHONY: cleandepend
+.NOTMAIN: cleandepend
+
+.if !defined(NOSUBDIR)					# {
+
+.for dir in ${SUBDIR}
+.if exists(${dir}.${MACHINE})
+__REALSUBDIR+=${dir}.${MACHINE}
+.else
+__REALSUBDIR+=${dir}
+.endif
+.endfor
+
+__recurse: .USE
+	@${MAKEDIRTARGET} ${.TARGET:C/^[^-]*-//} ${.TARGET:C/-.*$//}
+
+.if make(cleandir)
+__RECURSETARG=	${TARGETS:Nclean}
+clean:
+.else
+__RECURSETARG=	${TARGETS}
+.endif
+
+# for obscure reasons, we can't do a simple .if ${dir} == ".WAIT"
+# but have to assign to __TARGDIR first.
+.for targ in ${__RECURSETARG}
+.for dir in ${__REALSUBDIR}
+__TARGDIR := ${dir}
+.if ${__TARGDIR} == ".WAIT"
+SUBDIR_${targ} += .WAIT
+.elif !commands(${targ}-${dir})
+${targ}-${dir}: .PHONY .MAKE __recurse
+SUBDIR_${targ} += ${targ}-${dir}
+.endif
+.endfor
+subdir-${targ}: .PHONY ${SUBDIR_${targ}}
+${targ}: subdir-${targ}
+.endfor
+
+.endif	# ! NOSUBDIR					# }
+
+${TARGETS}:	# ensure existence