made sha256.lua work with ocemu

modules/lib/sha256.lua

@@ -8,7 +8,11 @@
 -- Data card support added by https://github.com/SuPeRMiNoR2
 _G.sha = {}
 if component then
- if component.data then
+ if component.data and not component.ocemu then
+  shamode = "hardware"
+ end
+end
+if shamode == "hardware" then
  datac = component.data
  function sha.sha256(data)
   local d=component.data.sha256(data)
@@ -16,7 +20,6 @@ if component then
    return string.format("%02x", string.byte(c))
   end))
  end
- end
 else
 local MOD = 2^32
 local MODM = MOD-1