don't use LLVM_BUILD_LLVM_DYLIB or LLVM_LINK_LLVM_DYLIB for Windows builds * llvm.mk: The LLVM_BUILD_LLVM_DYLIB and LLVM_LINK_LLVM_DYLIB options are documented to be unsupported for Windows builds of LLVM. Without these options, the Windows build still creates an LLVM.dll file, but also creates .a files for the components. Update comments.

mxe.cc