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, 3 deletions

diff --git a/graphics/vcg/Makefile b/graphics/vcg/Makefile
index 10a5e6876019..2365951aea18 100644
--- a/graphics/vcg/Makefile
+++ b/graphics/vcg/Makefile
@@ -13,14 +13,13 @@ DISTNAME=	${PORTNAME}.20050204
 EXTRACT_SUFX=	.tgz
 
 MAINTAINER=	ports@FreeBSD.org
-COMMENT=	A Visualization Tool for compiler graphs
+COMMENT=	Visualization Tool for compiler graphs
 
 LICENSE=	GPLv2 # (or later)
 
-BUILD_DEPENDS=	imake:${PORTSDIR}/devel/imake
-
 WRKSRC=		${WRKDIR}/${PORTNAME}.${PORTVERSION}
 
+USES=		imake:env
 USE_XORG=	x11 xext
 MAKE_JOBS_UNSAFE=	yes