New USES imake to handle the dependency on imake.

This uses accept 'env' as an argument for ports that do use their own or a different do-configure target.

Modify xmkmf so it accept IMAKECPPFLAGS as default flags for imake and pass it to the called imake.
Modify xorg-cf-files (the FreeBSD.cf configuration file) to allow CppCmd to be overwritten.
Pass CppCmd CcCmd and CplusplusCmd via command line to each call of imake via IMAKECPPFLAGS
Pass IMAKE_DEFINE with the above arguments to MAKE_ARGS so that imake spawned from Makefile generated by a previous
imake also inherit the defined CppCmd CcCmd and CplusplusCmd.
Make imake use devel/tradcpp all the time, so that when buidling with clang we do not depend on gcc's cpp.
Make imake respect CC and CXX
Make imake respect USE_GCC (if set imake will use gcc's cpp).

While here:
- Remove a couple of indefinite articles from comments
- Trim headers
- Fix a couple of ports to build with clang or use: USE_GCC=any
- Fix a now useless redefinition of the extraction chain
- Fix a typo in japanese/Wnn7-lib bundled imake template definitions
- Fix some XMKMF execution with no env specified
- Use options helper in x11/xautolock to simplify the port

1 files changed, 2 insertions, 6 deletions

diff --git a/graphics/xpx/Makefile b/graphics/xpx/Makefile
index dcd0b9185b43..9a59ff8fcfbd 100644
--- a/graphics/xpx/Makefile
+++ b/graphics/xpx/Makefile
@@ -1,9 +1,5 @@
-# ports collection makefile for:	xpx
-# Date created:		25 Oct 1998
-# Whom:			Seiichirou Hiraoka
-#
+# Created by: Seiichirou Hiraoka
 # $FreeBSD$
-#
 
 PORTNAME=	xpx
 PORTVERSION=	1.41
@@ -17,8 +13,8 @@ COMMENT=	Simple pixel editing tool to generate data for KISS
 
 WRKSRC=		${WRKDIR}/${PORTNAME}
 
+USES=		imake
 USE_XORG=	x11 xext
-USE_IMAKE=	yes
 XMKMF=		xmkmf
 
 DOCSDIR=	${PREFIX}/share/doc/ja/${PORTNAME}