Update CONFIGURE_ARGS for how we pass CONFIGURE_TARGET to configure script.

Specifically, newer autoconf (> 2.13) has different semantic of the
configure target. In short, one should use --build=CONFIGURE_TARGET
instead of CONFIGURE_TARGET directly. Otherwise, you will get a warning
and the old semantic may be removed in later autoconf releases.

To workaround this issue, many ports hack the CONFIGURE_TARGET variable
so that it contains the ``--build='' prefix.

To solve this issue, under the fact that some ports still have
configure script generated by the old autoconf, we use runtime detection
in the do-configure target so that the proper argument can be used.

Changes to Mk/*:
 - Add runtime detection magic in bsd.port.mk
 - Remove CONFIGURE_TARGET hack in various bsd.*.mk
 - USE_GNOME=gnometarget is now an no-op

Changes to individual ports, other than removing the CONFIGURE_TARGET hack:

= pkg-plist changed (due to the ugly CONFIGURE_TARGET prefix in * executables)
  - comms/gnuradio
  - science/abinit
  - science/elmer-fem
  - science/elmer-matc
  - science/elmer-meshgen2d
  - science/elmerfront
  - science/elmerpost

= use x86_64 as ARCH
  - devel/g-wrap

= other changes
  - print/magicfilter
    GNU_CONFIGURE -> HAS_CONFIGURE since it's not generated by autoconf

Total # of ports modified:  1,027
Total # of ports affected: ~7,000 (set GNU_CONFIGURE to yes)

PR:		126524 (obsoletes 52917)
Submitted by:	rafan
Tested on:	two pointyhat 7-amd64 exp runs (by pav)
Approved by:	portmgr (pav)

5 files changed, 0 insertions, 5 deletions

diff --git a/japanese/eb/Makefile b/japanese/eb/Makefile
index 2c26cd0..3f0a4b0 100644
--- a/japanese/eb/Makefile
+++ b/japanese/eb/Makefile
@@ -59,7 +59,6 @@ USE_GETTEXT=	yes
 USE_PERL5=	yes
 GNU_CONFIGURE=	yes
 USE_LDCONFIG=	yes
-CONFIGURE_TARGET=	--build=${MACHINE_ARCH}-portbld-freebsd${OSREL}
 CONFIGURE_ARGS=	--enable-nls \
 		--with-gettext-includes=${LOCALBASE}/include \
 		--with-gettext-libraries=${LOCALBASE}/lib \
diff --git a/japanese/eblook/Makefile b/japanese/eblook/Makefile
index f7a9f44..668d36a 100644
--- a/japanese/eblook/Makefile
+++ b/japanese/eblook/Makefile
@@ -18,7 +18,6 @@ COMMENT=	Interactive EB interface command for seraching words in electoric dicti
 LIB_DEPENDS=	eb.12:${PORTSDIR}/japanese/eb
 
 GNU_CONFIGURE=		yes
-CONFIGURE_TARGET=	--build=${MACHINE_ARCH}-portbld-freebsd${OSREL}
 CONFIGURE_ARGS=		--with-eb-includes=${PREFIX}/include \
 			--with-eb-libraries=${PREFIX}/lib
 
diff --git a/japanese/ebnetd/Makefile b/japanese/ebnetd/Makefile
index c0b8846..b3f8daa 100644
--- a/japanese/ebnetd/Makefile
+++ b/japanese/ebnetd/Makefile
@@ -17,7 +17,6 @@ COMMENT=	Servers for accessing CD-ROM books via TCP/IP
 LIB_DEPENDS=	eb.12:${PORTSDIR}/japanese/eb
 
 GNU_CONFIGURE=	yes
-CONFIGURE_TARGET=	--build=${MACHINE_ARCH}-portbld-freebsd${OSREL}
 CONFIGURE_ARGS=	--localstatedir=${RUNDIR} --with-logdir=${LOGDIR}
 
 # Local variables
diff --git a/japanese/ebview/Makefile b/japanese/ebview/Makefile
index a78439f3..171ef71 100644
--- a/japanese/ebview/Makefile
+++ b/japanese/ebview/Makefile
@@ -22,7 +22,6 @@ CONFLICTS=	ja-ebview-gtk2-*
 USE_GNOME=	imlib
 USE_GMAKE=	yes
 USE_AUTOTOOLS=	autoconf:262
-CONFIGURE_TARGET=	--build=${MACHINE_ARCH}-portbld-freebsd${OSREL}
 CONFIGURE_ENV=	CPPFLAGS="${CPPFLAGS}" LDFLAGS="${LDFLAGS}"
 MAKE_ARGS=	ACLOCAL="${TRUE}" AUTOCONF="${TRUE}" AUTOMAKE="${TRUE}" \
 		AUTOHEADER="${TRUE}"
diff --git a/japanese/freepwing/Makefile b/japanese/freepwing/Makefile
index cfc8790..45b9e59 100644
--- a/japanese/freepwing/Makefile
+++ b/japanese/freepwing/Makefile
@@ -20,7 +20,6 @@ RUN_DEPENDS=	gmake:${PORTSDIR}/devel/gmake
 USE_PERL5=	yes
 USE_GMAKE=	yes
 GNU_CONFIGURE=	yes
-CONFIGURE_TARGET=	--build=${MACHINE_ARCH}-portbld-freebsd${OSREL}
 CONFIGURE_ARGS=	--with-pkgdocdir=${DOCSDIR}
 
 .include <bsd.port.mk>