testsuite: libsframest: use as, ld, collect-ld from build dir

testsuite: libsframest: use as, ld, collect-ld from build dir

instead of host's as and ld.  Also disable libsframest build if cross
compiling.  The testsuite will consequently also be skipped.

Override the check-am make target and first execute setup.sh to bring in
the as-new / ld-new and use -B<path> to ensure these are picked up for
building:
  - libsframest
  - libsframe.stacktrace testsuite

Remove the configure time variable HAVE_SFRAME_AS as it is now
unnecessary.

TBD:
  - Get review on whether the whole setup.sh way of doing this is OK.
    But it seems there is no other way ?
  - Check the portability of the setup.sh script.

ChangeLog:
	* libsframe/Makefile.am: Override check-am to first run setup.sh
	before invoking make.  This ensures libsframest is built with
	the newly setup tmpdir/libsframe.
	* libsframe/Makefile.in: Regenerate.
	* libsframe/acinclude.m4: Delete.
	* libsframe/aclocal.m4: Remove include for acinclude.m4.
	* libsframe/configure: Regenerate.
	* libsframe/configure.ac: Remove HAVE_SFRAME_AS.  Add a new
	AM_CONDITIONAL for CROSS_COMPILE.
	* libsframe/setup.sh: New file.
	* libsframe/testsuite/config/default.exp: Remove the creation
	and setup of tmpdir/lisframe.
	* libsframe/testsuite/lib/sframe-lib.exp: Use -B<path> to use
	the as/ld from build tree.
	* libsframe/testsuite/libsframe.stacktrace/libsframest/local.mk:
	Use -B<path> and use the as/ld from build tree.
	* libsframe/testsuite/libsframe.stacktrace/stacktrace.exp: Skip
	testing if cross build.