package/libopenssl: set no-asm with generic architectures

package/libopenssl: set no-asm with generic architectures

Use no-asm when building with generic architectures such as gcc or
linux-generic32, see https://github.com/openssl/openssl/issues/9839

This will fix a static build failure on x86_64 due to the removal of
x86/x86_64 BSAES and AES_ASM support by
https://github.com/openssl/openssl/commit/87bea6550ae0dda7c40937cff2e86cc2b0b09491

Fixes:
 - http://autobuild.buildroot.org/results/e4f04bb13ec1b82b73db645bea4933e52bca4185

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>