configure.ac: We don't need no C++ compiler

Signed-off-by: Ruben Kerkhof <ruben@rubenkerkhof.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

configure.ac

@@ -81,7 +81,6 @@ fi
 sinclude(corosync-default.m4)
 
 AC_PROG_CC
-AC_PROG_CXX
 AC_PROG_INSTALL
 AC_PROG_LN_S
 AC_PROG_MAKE_SET