gstreamer: fix xtensa configure

Disable unaligned access to avoid configure run test.

Fixes
http://autobuild.buildroot.net/results/a0c/a0cca019b0b2f33b6c2be17e5a44a807bbb4dac1/.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/gstreamer/gstreamer/gstreamer.mk

@@ -12,7 +12,7 @@ GSTREAMER_INSTALL_STAGING = YES
 # Checking if unaligned memory access works correctly cannot be done when cross
 # compiling. For the following architectures there is no information available
 # in the configure script.
-ifeq ($(BR2_avr32),y)
+ifeq ($(BR2_avr32)$(BR2_xtensa),y)
 GSTREAMER_CONF_ENV = as_cv_unaligned_access=no
 endif
 ifeq ($(BR2_aarch64),y)