re PR bootstrap/66304 (Can't bootstrap on x86_64-linux-gnu with gcc 4.3.4)

re PR bootstrap/66304 (Can't bootstrap on x86_64-linux-gnu with gcc 4.3.4)

	PR bootstrap/66304
config/
	* warnings.m4 (ACX_PROG_CXX_WARNING_OPTS)
	(ACX_PROG_CXX_WARNINGS_ARE_ERRORS)
	(ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC): New.
	(ACX_PROG_CC_WARNING_OPTS, ACX_PROG_CC_WARNING_ALMOST_PEDANTIC)
	(ACX_PROG_CC_WARNINGS_ARE_ERRORS): Push into C language context.
gcc/
	* configure.ac: Use ACX_PROG_CXX_WARNING_OPTS,
	ACX_PROG_CXX_WARNING_ALMOST_PEDANTIC, and
	ACX_PROG_CXX_WARNINGS_ARE_ERRORS.
	* configure: Regenerate.

From-SVN: r223763