gcc: drop options that do not exist, disable serial configure

srcpkgs/gcc/template

@@ -221,7 +221,6 @@ do_configure() {
 
 		_args+=" --host=$XBPS_CROSS_TRIPLET"
 		_args+=" --with-build-sysroot=${XBPS_CROSS_BASE}"
-		_args+=" --enable-sjlj-exceptions=no"
 		_langs+=",objc,obj-c++,fortran"
 	elif [ -z "$CHROOT_READY" ]; then
 		export LD_LIBRARY_PATH="${XBPS_MASTERDIR}/usr/lib${XBPS_TARGET_WORDSIZE}"
@@ -229,7 +228,6 @@ do_configure() {
 	else
 		_langs="c,c++,objc,obj-c++,fortran,lto"
 		_args+=" --build=${_triplet}"
-		_args+=" --enable-fast-character"
 	fi
 
 	if [ "$_have_gccgo" = "yes" ]; then
@@ -276,15 +274,9 @@ do_configure() {
 	_args+=" --disable-libstdcxx-pch"
 	_args+=" --with-isl"
 	_args+=" --with-linker-hash-style=$_hash"
-	_args+=" --disable-libunwind-exceptions"
+	_args+=" --disable-sjlj-exceptions"
 	_args+=" --disable-target-libiberty"
 
-	# --enable-serial-configure is broken when cross-compiling for
-	# some targets because it introduces make rule dependency cycles
-	if [ ! "$CROSS_BUILD" ]; then
-		_args+=" --enable-serial-configure"
-	fi
-
 	mkdir -p build
 	cd build
 	if [ "$build_option_gnatboot" ]; then