[Patch,ld] Fix check_lto_available

[Vidya Praveen]

Hello,

This patch modifies check_lto_available of ld regression test to

1. Make use of cflags, ldflags from board description file

2. Test by building an executable rather than a shared library
   - This is needed for the baremetal targets as shared library makes no sense
     to the baremetal targets. lto.exp which makes use of this check also has
     guard for shared library tests.

Reference:
https://sourceware.org/ml/binutils/2013-10/msg00214.html

Tested for aarch64-none-elf and arm-none-eabi, arm-none-linux-gnueabihf and
x86_64-unknown-linux-gnu.

OK for trunk?

Cheers
VP.

ld/testsuite/ChangeLog:

2013-12-11  Vidya Praveen  <vidyapraveen@arm.com>

	* lib/ld-lib.exp (check_lto_available): Support cflags,ldflags and
	test by compiling for an executable rather than shared library.

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