configure.ac: Redirect grep stdout, stderr to /dev/null instead of grep -q.

configure.ac: Redirect grep stdout, stderr to /dev/null instead of grep -q.

	libjava:
	* configure.ac: Redirect grep stdout, stderr to /dev/null instead
	of grep -q.
	Use -- instead of grep -e.
	* configure: Regenerate.

	gcc:
	* configure.ac (gcc_cv_as_ld_jalr_reloc): Redirect grep stdout,
	stderr to /dev/null instead of grep -q.
	* configure: Regenerate.

	contrib:
	* dg-extract-results.sh: Redirect grep output to /dev/null instead
	of grep -q.

From-SVN: r159840