package/php: force arm mode instead of Thumb mode

Fix the following build failure:
/tmp/ccqcLrVb.s:4053: Error: selected processor does not support `umlal r2,r1,r0,r3' in Thumb mode
/tmp/ccqcLrVb.s:4076: Error: selected processor does not support `umlal r0,r3,r1,r2' in Thumb mode
/tmp/ccqcLrVb.s:8644: Error: selected processor does not support `umlal r0,r3,r2,r4' in Thumb mode

Fixes:
http://autobuild.buildroot.net/results/1d09a0a58cbc1712416de746d57d4532df580673/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/php/php.mk

@@ -84,6 +84,13 @@ else
 PHP_CONF_ENV += ac_cv_func_dlopen=no ac_cv_lib_dl_dlopen=no
 endif
 
+# php has some assembly function that is not present in Thumb mode:
+# Error: selected processor does not support `umlal r2,r1,r0,r3' in Thumb mode
+# so, we desactivate Thumb mode
+ifeq ($(BR2_ARM_INSTRUCTIONS_THUMB),y)
+PHP_CFLAGS += -marm
+endif
+
 PHP_CONF_OPTS += $(if $(BR2_PACKAGE_PHP_SAPI_CLI),--enable-cli,--disable-cli)
 PHP_CONF_OPTS += $(if $(BR2_PACKAGE_PHP_SAPI_CGI),--enable-cgi,--disable-cgi)
 PHP_CONF_OPTS += $(if $(BR2_PACKAGE_PHP_SAPI_FPM),--enable-fpm,--disable-fpm)