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, 11 insertions, 0 deletions

diff --git a/devel/imake/files/patch-imakemdep.h b/devel/imake/files/patch-imakemdep.h
new file mode 100644
index 000000000000..87a8662f7587
--- /dev/null
+++ b/devel/imake/files/patch-imakemdep.h
@@ -0,0 +1,11 @@
+--- ./imakemdep.h.orig	2012-03-08 06:47:32.000000000 +0100
++++ ./imakemdep.h	2013-06-12 20:22:52.058999526 +0200
+@@ -380,7 +383,7 @@
+     defined(__GNUC__) || defined(__GLIBC__)
+ #    ifdef __i386__
+ 	"-D__i386__",
+-#     if defined(__GNUC__) && (__GNUC__ >= 3)
++#     if defined(__GNUC__) && (__GNUC__ >= 3) && !defined(__FreeBSD__)
+ 	"-m32",
+ #     endif
+ #    endif