ghash-x86.pl: engage original MMX version in no-sse2 builds.

crypto/modes/asm/ghash-x86.pl

@@ -331,7 +331,7 @@ if (!$x86only) {{{
 
 &static_label("rem_4bit");
 
-if (0) {{	# "May" MMX version is kept for reference...
+if (!$sse2) {{	# pure-MMX "May" version...
 
 $S=12;		# shift factor for rem_4bit
 

crypto/modes/gcm128.c

@@ -726,7 +726,11 @@ void CRYPTO_gcm128_init(GCM128_CONTEXT *ctx,void *key,block128_f block)
 #  endif
 	gcm_init_4bit(ctx->Htable,ctx->H.u);
 #  if	defined(GHASH_ASM_X86)			/* x86 only */
+#   if	defined(OPENSSL_IA32_SSE2)
+	if (OPENSSL_ia32cap_P[0]&(1<<25)) {	/* check SSE bit */
+#   else
 	if (OPENSSL_ia32cap_P[0]&(1<<23)) {	/* check MMX bit */
+#   endif
 		ctx->gmult = gcm_gmult_4bit_mmx;
 		ctx->ghash = gcm_ghash_4bit_mmx;
 	} else {