secur32: Allow loading external schannel.dll.

[Huang, Zhangrong]

Hi,

Since secur32.dll has implement the SecurityFunctionTable of schannel
provider built-in, and schannel.dll's SecurityFunctionTable is  just
farwarded to secur32.dll, there're some problems when trying to load
external schannel.dll.

First, by setting the following registry, when loading secur32.dll we
get duplicate schannel providers.
[System\\CurrentControlSet\\Control\\SecurityProviders]
"SecurityProviders"="schannel.dll"

Second, SECUR32_findPackageW doesn't load external schannel.dll when needed.

This patch will fix these problems. If loading schannel.dll
successful, secur32.dll can call SpLsaModeInitialize to get the
SECPKG_FUNCTION_TABLE later.

-- 
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