Add constraints for OBS

The tests on x86_64 require those instructions.

Signed-off-by: Igor Raits <ignatenkobrain@fedoraproject.org>

_constraints

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<constraints>
+  <overwrite>
+    <conditions>
+      <arch>x86_64</arch>
+    </conditions>
+    <hardware>
+      <cpu>
+        <flag>sse2</flag>
+        <flag>avx</flag>
+      </cpu>
+    </hardware>
+  </overwrite>
+</constraints>