Update libtheora to GIT (2020.10)

modules/theora/SCsub

@@ -15,7 +15,7 @@ if env["builtin_libtheora"]:
         # "analyze.c",
         # "apiwrapper.c",
         "bitpack.c",
-        "cpu.c",
+        # "collect.c",
         # "decapiwrapper.c",
         "decinfo.c",
         "decode.c",
@@ -47,8 +47,12 @@ if env["builtin_libtheora"]:
         "x86/mmxfrag.c",
         "x86/mmxidct.c",
         "x86/mmxstate.c",
+        # "x86/sse2encfrag.c",
         # "x86/sse2fdct.c",
+        "x86/sse2idct.c",
+        "x86/x86cpu.c",
         # "x86/x86enc.c",
+        # "x86/x86enquant.c"
         "x86/x86state.c",
     ]
 
@@ -58,6 +62,7 @@ if env["builtin_libtheora"]:
         "x86_vc/mmxfrag.c",
         "x86_vc/mmxidct.c",
         "x86_vc/mmxstate.c",
+        "x86_vc/x86cpu.c",
         # "x86_vc/x86enc.c",
         "x86_vc/x86state.c",
     ]