Fix 31252 gprofng causes testsuite parallel jobs fail

Before running our tests, we made a fake installation into ./tmpdir.
This installation changes libopcodes.la in the build area.
Gas testing may fail if gas and gprofng tests are run in parallel.

I create a script to run gprofng. Inside this script, LD_LIBRARY_PATH,
GPROFNG_SYSCONFDIR are set.
putenv_libcollector_ld_misc() first uses $GPROFNG_PRELOAD_LIBDIRS to create
directories for SP_COLLECTOR_LIBRARY_PATH ($SP_COLLECTOR_LIBRARY_PATH is used
to set up LD_PRELOAD).

gprofng/ChangeLog
2024-01-19  Vladimir Mezentsev  <vladimir.mezentsev@oracle.com>

	PR gprofng/31252
	PR gprofng/30808
	* src/envsets.cc (putenv_libcollector_ld_misc): Use
	$GPROFNG_PRELOAD_LIBDIRS first to build SP_COLLECTOR_LIBRARY_PATH.
	* testsuite/config/default.exp: Create a script to run gprofng.
	* testsuite/lib/display-lib.exp: Fix typo.

(cherry picked from commit 26f557af)