configure.ac: fix description of SETLANGDEFAULTS_TAKES_5_ARGUMENTS
configure.ac: fix description of SETLANGDEFAULTS_TAKES_5_ARGUMENTS

The description was apparently copied from that of ADDPATH_TAKES_4_ARGUMENTS
by mistake in 35b0ae0 (interface: update to CompilerInvocation::setLangDefaults
taking 5 arguments, Sat Jun 25 11:09:33 2016 +0200).

Signed-off-by: Sven Verdoolaege <e5350bbed4977f5eb8ae1dc6abd9ae59d21ace75@kotnet.org>

PollyLabs/isl,PollyLabs/isl,nicolasvasilache/isl,tobig/isl,tobig/isl,nicolasvasilache/isl,UBERTC/isl,Meinersbur/isl,Meinersbur/isl,tobig/isl,nicolasvasilache/isl,PollyLabs/isl,nicolasvasilache/isl,PollyLabs/isl,Meinersbur/isl,tobig/isl,inducer/isl-mirror,UBERTC/isl,Meinersbur/isl,inducer/isl-mirror,UBERTC/isl,PollyLabs/isl,nicolasvasilache/isl,inducer/isl-mirror,UBERTC/isl,inducer/isl-mirror,inducer/isl-mirror