waf-samba.bbclass: add missing qemu options

- QEMU_OPTIONS is needed for running binary through qemu,
  add it for CROSS_EXEC.
- "-r ${OLDEST_KERNEL}" is already included in QEMU_OPTIONS,
  remove it from CROSS_EXEC

Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/classes/waf-samba.bbclass

@@ -28,10 +28,9 @@ do_configure() {
 
     libdir_qemu="${STAGING_DIR_HOST}/${libdir}"
     base_libdir_qemu="${STAGING_DIR_HOST}/${base_libdir}"
-    oldest_kernel_qemu=${OLDEST_KERNEL}
 
     CROSS_EXEC="${qemu_binary} \
-                -r ${oldest_kernel_qemu} \
+                ${QEMU_OPTIONS} \
                 -L ${STAGING_DIR_HOST} \
                 -E LD_LIBRARY_PATH=${libdir_qemu}:${base_libdir_qemu}"