Unbreak after r1.651 of bsd.port.mk.

The port Makefile uses multiple .c files in the ${CPP} line,
which cpp can't cope with.
Modify the port Makefile so that it uses CPP=${CC} -E again,
like before r1.651.

Submitted by:	pointyhat

devel/newt/files/patch-ab

@@ -1,13 +1,25 @@
---- Makefile.in	2009-09-24 11:03:09.000000000 -0400
-+++ Makefile.in	2010-01-06 01:33:55.000000000 -0500
-@@ -51,5 +51,5 @@
+--- Makefile.in.orig	2009-09-24 17:03:09.000000000 +0200
++++ Makefile.in	2010-11-03 15:56:33.000000000 +0100
+@@ -2,7 +2,7 @@ LIBS = -lslang
+ LIBTCL = -ltcl8.4
+ 
+ CC = @CC@
+-CPP = @CPP@
++CPP = $(CC) -E
+ CFLAGS = @CFLAGS@
+ CPPFLAGS = -D_GNU_SOURCE -I/usr/include/slang @CPPFLAGS@ 
+ 
+@@ -50,7 +50,7 @@ else
+ TARGET=depend $(PROGS)
  endif
  
 -all:	$(TARGET) _snackmodule.so
 +all:	$(TARGET)
  
  test:	test.o $(LIBNEWT)
-@@ -68,11 +68,11 @@
+ 	$(CC) -g -o test test.o $(LIBNEWT) $(LIBS)
+@@ -67,19 +67,19 @@ showchars:	showchars.o $(LIBNEWT)
+ showkey:	showkey.o $(LIBNEWT)
  	$(CC) -g -o showkey showkey.o $(LIBNEWT) $(LIBS)
  
 +ifdef PYTHONVERS
@@ -25,14 +37,16 @@
 +endif
  
  whiptail: $(NDIALOGOBJS) $(LIBNEWTSH)
-@@ -80,5 +80,5 @@
+ 	$(CC) -g -o whiptail $(NDIALOGOBJS) -L . -lnewt $(LIBS) -lpopt
  
  whiptcl.so: $(WHIPTCLOBJS) $(LIBNEWTSH)
 -	$(CC) -shared $(SHCFLAGS) -o whiptcl.so $(WHIPTCLOBJS) -L . -lnewt  $(LIBTCL) -lpopt
 +	$(CC) -shared $(SHCFLAGS) -o whiptcl.so $(WHIPTCLOBJS) -L . -lnewt  $(LIBTCL) $(LIBS) -lpopt
  
  $(LIBNEWT): $(LIBOBJS)
-@@ -119,18 +119,18 @@
+ 	ar rv $@ $^
+@@ -118,20 +118,20 @@ install: $(LIBNEWT) install-sh whiptail
+ 	install -m 644 $(LIBNEWT) $(instroot)/$(libdir)
  	install -m 755 whiptail $(instroot)/$(bindir)
  	install -m 644 whiptail.1 $(instroot)/$(man1dir)
 -	make -C po datadir=$(instroot)/$(datadir) install
@@ -60,3 +74,4 @@
 +endif
  
  Makefile: newt.spec
+ 	echo "You need to rerun ./configure before continuing"