126524 – [bsd.port.mk] update CONFIGURE_TARGET for newer autoconf (>2.13)

no flags

	Newer autoconf (>2.13) use different semantics for configure target.
	To be specific, one should use --build=CONFIGURE_TARGET instead of
	plain CONFIGURE_TARGET. Hence, this makes lots of ports (~1,000)
	hack CONFIGURE_TARGET in their Makefile. This should be done in
	bsd.port.mk to ease the amount of work required by maintainers.

	This PR obsoletes 52917.

Fix: Since we still have ports uses autoconf 2.13, my approach is
	to use appropriate syntax which is determined at do-configure.
	Note that this patch also makes USE_GNOME=gnometarget an no-op.

	Specific changes to individual ports:

	* plist changed
	  - science/abinit
	  - science/elmer-meshgen2d
	  - science/elmer-matc
	  - science/elmer-fem
	  - science/elmerpost
	  - science/elmerfront
	  - comms/gnuradio

	* use x86_64 as ARCH
	  - devel/g-wrap

	* others
	  - print/magicfilter (GNU_CONFIGURE -> HAS_CONFIGURE)
	  - x11-toolkits/wxgtk24-contrib (wxgtk24): remove CONFIGURE_TARGET from CONFIGURE_ARGS
 
	Total # of ports affected: ~7,000 (GNU_CONFIGURE=yes)
	Total # of ports modified: ~1,000 (defines CONFIGURE_TARGET)

	With few runs in my amd64 tinderbox, the result looks promising.
	However, I believe this patch requires few -exp runs to shake
	out possible issues.

	This patch is also available at 

	http://people.freebsd.org/~rafan/configure_target.20080814.patch.gz	

	MD5 (configure_target.20080814.patch.gz) = f7ff402ba3fbe247aecc3e859f0ed9f5