Bug 1262348. Block ss2osd.dll r=bsmedberg

ss2osd.dll is causing crashes during D3D11 initialization.

mozglue/build/WindowsDllBlocklist.cpp

@@ -201,6 +201,10 @@ static DllBlockInfo sWindowsDllBlocklist[] = {
   // ESET, bug 1229252
   { "eoppmonitor.dll", ALL_VERSIONS },
 
+  // SS2OSD, bug 1262348
+  { "ss2osd.dll", ALL_VERSIONS },
+  { "ss2devprops.dll", ALL_VERSIONS },
+
   { nullptr, 0 }
 };