crypt32: implement CryptSIPLoad (resend)

[Juan Lang]

> You should use module handles to identify dlls, not file names.

Okay.

> You can use GetModuleHandle to find out if a dll is loaded already.

I'm not sure that's safe:  if the calling application has loaded a dll
containing a SIP already, calls CryptSIPLoad,  unloads the dll, then
calls a function via the SIP, it'll fail.  If I want to make sure that
doesn't happen, I should LoadLibrary myself, yes?  Then I'm forced to
search by name myself, am I not?

Thanks,
--Juan