Mk: refactor install/plist code a wee bit

Mk/tree.mk

+all:
+
+install:
+.for TREE in ${TREES}
+	@mkdir -p ${DESTDIR}${ROOT}
+	@cp -vr ${TREE} ${DESTDIR}${ROOT}
+.endfor
+
+plist:
+.for TREE in ${TREES}
+	@(cd ${TREE}; find * -type f) | \
+	    xargs -n1 printf "${ROOT}/${TREE}/%s\n"
+.endfor
+
+.PHONY: install plist

contrib/Makefile

-all:
+ROOT=	/usr/local/share
+TREES=	openvpn mobile-broadband-provider-info
 
-install:
-	@mkdir -p ${DESTDIR}/usr/local/share
-	@cp -vr ${.CURDIR}/openvpn ${DESTDIR}/usr/local/share/
-	@cp -vr ${.CURDIR}/mobile-broadband-provider-info \
-	    ${DESTDIR}/usr/local/share/
-
-plist:
-	@(cd ${.CURDIR}/openvpn; find * -type f) | \
-	    xargs -n1 printf "/usr/local/share/openvpn/%s\n"
-	@(cd ${.CURDIR}/mobile-broadband-provider-info; find * -type f) | \
-	    xargs -n1 printf \
-	    "/usr/local/share/mobile-broadband-provider-info/%s\n"
-
-.PHONY: install plist
+.include "../Mk/tree.mk"

pkg/Makefile

-all:
+ROOT=	/usr/local/etc/pkg
+TREES=	repos fingerprints
 
-install:
-	@mkdir -p ${DESTDIR}/usr/local/etc/pkg
-	@cp -vr ${.CURDIR}/repos ${DESTDIR}/usr/local/etc/pkg/
-	@cp -vr ${.CURDIR}/fingerprints ${DESTDIR}/usr/local/etc/pkg/
-
-plist:
-	@(cd ${.CURDIR}/repos; find * -type f) | \
-	    xargs -n1 printf "/usr/local/etc/pkg/repos/%s\n"
-	@(cd ${.CURDIR}/fingerprints; find * -type f) | \
-	    xargs -n1 printf "/usr/local/etc/pkg/fingerprints/%s\n"
-
-.PHONY: install plist
+.include "../Mk/tree.mk"