If no explicit XARCH is specified, use the toolchains default.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
---
Thomas Weißschuh (2):
      selftests/nolibc: drop dependency from sysroot to defconfig
      selftests/nolibc: only consider XARCH for CFLAGS when requested

 tools/testing/selftests/nolibc/Makefile | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
base-commit: 9a9b20007ab833c1aa3791efcfdf67e7e3ea8902
change-id: 20250330-nolibc-nolibc-test-native-6d4d84d764eb

Best regards,
-- 
Thomas Weißschuh <linux@weissschuh.net>