util/xcompile/xcompile: Use tab for indent

Change-Id: I9878e6d962004003e2c05a6cdb8ecb0a3a02ae66
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/30352
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

util/xcompile/xcompile

@@ -238,7 +238,7 @@ EOF
 # to use i586 instead.
 if [ "${TARCH}" = "x86_64" ]; then
 cat <<EOF
-        GCC_CFLAGS_${TARCH} += -march=nocona
+	GCC_CFLAGS_${TARCH} += -march=nocona
 EOF
 fi