makepanda: Only add -msse2 when building for x86 platforms

Partial backport of 2759fb9606ee743660dafac61ed60bba34f9c0f8

makepanda/makepanda.py

@@ -1658,7 +1658,7 @@ def CompileCxx(obj,src,opts):
                 if optlevel >= 4 or target == "android":
                     cmd += " -fno-rtti"
 
-        if ('SSE2' in opts or not PkgSkip("SSE2")) and not arch.startswith("arm") and arch != 'aarch64':
+        if ('SSE2' in opts or not PkgSkip("SSE2")) and arch.find('86') > 0:
             cmd += " -msse2"
 
         # Needed by both Python, Panda, Eigen, all of which break aliasing rules.