[CMake][Win32.DLL] Let llvm_add_library(SHARED) link dependent libraries as PRIVATE.
For example, c-index-test.exe requires just libclang.dll (its import library).
When libraries in libclang were not PRIVATE but PUBLIC, c-index-test required libraries transitive by libclang.
Note, on mingw with BUILD_SHARED_LIBS, library dependencies would become more strict.
In principle, required libraries should be "required in its source file".
This will help to detect missing dependencies.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212934
91177308-0d34-0410-b5e6-
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