Test only x86_64

Author: nicodr97

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        arch: [x86, x86_64]
+        arch: [x86_64]
         cpu_instr: [non-SIMD, SSE2, AVX2, NEON, auto-selected]
 
     steps: