package/libressl: disable asm for mips64/mips64el

LibreSSL fails in the same way as powerpc, so disable
asm too for these architectures.

Fixes:
 - http://autobuild.buildroot.net/results/788/7883ffe9ed96f38f9ca359e99a18a548b6f35c24/

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libressl/libressl.mk

@@ -14,7 +14,7 @@ LIBRESSL_CONF_OPTS = -DLIBRESSL_TESTS=OFF -DOPENSSLDIR="/etc/ssl"
 
 # Otherwise fails to build with undefined reference to
 # `bn_mul_add_words'
-ifeq ($(BR2_powerpc),y)
+ifeq ($(BR2_powerpc)$(BR2_mips64)$(BR2_mips64el),y)
 LIBRESSL_CONF_OPTS += -DENABLE_ASM=OFF
 endif