Fix build on -CURRENT and honor CC.

Problem reported by:	Gerrit Kuehn <gerrit@pmp.uni-hannover.de>

net/mars_nwe/Makefile

@@ -18,14 +18,12 @@ EXTRACT_SUFX=	.tgz
 MAINTAINER=	bp@FreeBSD.org
 
 WRKSRC=		${WRKDIR}/mars_nwe
+MAKE_ENV=	CC="${CC}"
 
 PLIST=	${WRKDIR}/PLIST.DYN
 
 NDOCDIR=	${PREFIX}/share/doc/mars_nwe
 
-do-build:
-	@(cd ${WRKSRC} && ${MAKE} all)
-
 do-install:
 	@(cd ${WRKSRC} && ./mk.li install)
 	@${INSTALL_DATA} ${WRKSRC}/examples/nw.ini ${PREFIX}/etc/nwserv.conf.example

net/mars_nwe/files/patch-ac

@@ -0,0 +1,16 @@
+
+$FreeBSD$
+
+--- examples/mk.li.orig	Sat Jan 15 12:11:20 2000
++++ examples/mk.li	Mon Nov 25 15:12:38 2002
+@@ -97,8 +97,8 @@
+    freebsd)
+      V_VPATH=".."
+      OBJDIR="obj"
+-     CC=gcc
+-     CPP="gcc -E"
++     CC=${CC:-cc}
++     CPP="cpp -traditional"
+      if [ "x$CFLAGS" = "x" ]; then
+        CFLAGS="native"
+      fi