CONFIGURE: Disable -pedantic on raspberrypi target

Because of very noisy warnings from system headers using #include_next
extension, and such.

configure

@@ -2356,6 +2356,15 @@ if test "$have_gcc" = yes ; then
 	*)
 		;;
 	esac
+
+	if test -n "$_host"; then
+		case "$_host" in
+		raspberrypi)
+			pedantic=no
+			;;
+		esac
+	fi
+
 	append_var CXXFLAGS "-W -Wno-unused-parameter"
 	add_line_to_config_mk 'CXX_UPDATE_DEP_FLAG = -MMD -MF "$(*D)/$(DEPDIR)/$(*F).d" -MQ "$@" -MP'