wip/gcc45: test results on NetBSD

Hi,

make test on NetBSD showed 1524 errors due to libelf problems in
the gcc tests. I have added the following three lines in Makefile
for local testing after installing devel/libelf and devel/binutils.
FreeBSD ports also uses this strategy since gcc-4.4. Well, this
reduces the number of failures in gcc tests by 1524. gfortran is unaffected. 

CONFIGURE_ARGS+=	--with-as=${PREFIX}/bin/gnu-as
CONFIGURE_ARGS+=	--with-ld=${PREFIX}/bin/gnu-ld
CONFIGURE_ARGS+=	--with-libelf=${PREFIX}

Using binutils should help in maintaining this package for different
platforms, but I guess there were good reasons to stay away from this
in lang/gcc44. 

Test run on i3, 4 GB, stacksize and data set to the hard limits:

Native configuration is i386-unknown-netbsdelf5.99.45 

		=== gcc Summary ===

# of expected passes		70561
# of unexpected failures	162
# of unexpected successes	23
# of expected failures		183
# of unresolved testcases	10
# of unsupported tests		1603
		=== g++ Summary ===

# of expected passes		23126
# of unexpected failures	17
# of expected failures		151
# of unsupported tests		152
		=== gfortran Summary ===

# of expected passes		33891
# of unexpected failures	35
# of expected failures		20
# of unsupported tests		274

		=== objc Summary ===

# of expected passes		1912
# of expected failures		7
# of unsupported tests		20
		=== libstdc++ Summary ===

# of expected passes		3742
# of unexpected failures	2277
# of expected failures		87
# of unsupported tests		783
		=== libgomp Summary ===

# of expected passes		2390
# of unexpected failures	116
# of unsupported tests		2

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