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Using and operation when detecting Loongson mmi instructions

The Loongson 64-bit simd optimizations has used LEXT1(LoongISA general EXTensions 1),
so we must make sure loongson-mmi and loongson-ext exist at the same time.

--- a/codec/common/src/cpu.cpp

+++ b/codec/common/src/cpu.cpp

@@ -331,7 +331,7 @@

     }

     while (fgets(buf, sizeof(buf), fp)) {

         if(!strncmp(buf, "ASEs implemented", strlen("ASEs implemented"))) {

-            if (strstr(buf, "loongson-mmi") || strstr(buf, "loongson-ext")) {

+            if (strstr(buf, "loongson-mmi") && strstr(buf, "loongson-ext")) {

                 flags |= WELS_CPU_MMI;

             }

             if (strstr(buf, "msa")) {