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, 1 insertions, 1 deletions

diff --git a/games/xneko/Makefile b/games/xneko/Makefile
index b58693866ac2..76918e2b612a 100644
--- a/games/xneko/Makefile
+++ b/games/xneko/Makefile
@@ -14,7 +14,7 @@ MAINTAINER=	dinoex@FreeBSD.org
 COMMENT=	The classic cat-and-mouse
 
 NO_WRKSUBDIR=	yes
-USE_IMAKE=	yes
+USES=		imake
 USE_XORG=	x11
 MAN6=		xneko.6
 PLIST_FILES=	bin/xneko