[Update] Gdal 1.8.1 -> 1.9.0

[Jan Beich]

"coder.tuxfamily" <coder at tuxfamily.org> writes:

> There is a new version of Gdal (graphics/gdal) 1.9.0.
> Here the diff, seems works but don't have time to make all tests.
[...]
> @@ -17,7 +16,7 @@
>  COMMENT=	A translator library for geospatial data formats
> 
>  CONFIGURE_ARGS=	--datadir=${DATADIR} --with-libz=/usr
> -CONFIGURE_ENV=	LDFLAGS="${LDFLAGS}"
> +CONFIGURE_ENV=	LDFLAGS+="${LDFLAGS}"
>  GNU_CONFIGURE=	yes
>  LDFLAGS+=	-L${LOCALBASE}
>  MAKEFILE=	GNUmakefile

Passing LDFLAGS seems redundant since ports/157936. The line was added
just a day before the sweeping removal.