avoid a two-step SUBST_CMD/INSTALL_SCRIPT process by using new(ish)

SUBST_CMD -m to set the mode while copying.

devel/vtcl/Makefile

@@ -1,4 +1,4 @@
-# $OpenBSD: Makefile,v 1.9 2013/03/11 10:50:31 espie Exp $
+# $OpenBSD: Makefile,v 1.10 2013/05/04 10:00:52 sthen Exp $
 
 COMMENT=		Visual Tcl development environment
 
@@ -30,8 +30,8 @@ do-install:
 	     ${WRKSRC}/demo ${PREFIX}/lib/vtcl
 	cp -R ${WRKSRC}/sample ${PREFIX}/share/examples/vtcl
 	cp -R ${WRKSRC}/doc ${PREFIX}/share/doc/vtcl
-	${SUBST_CMD} -c ${FILESDIR}/vtcl ${WRKDIST}/vtcl
-	${INSTALL_SCRIPT} ${WRKDIST}/vtcl ${PREFIX}/bin
+	${SUBST_CMD} -o ${BINOWN} -g ${BINGRP} -m ${BINMODE} -c \
+	    ${FILESDIR}/vtcl ${PREFIX}/bin/vtcl
 
 NO_TEST=		Yes