build: fix the clang-cl executable link command
build: fix the clang-cl executable link command

ClangClCompileRules.cmake overrides CMAKE_C_LINK_EXECUTABLE to invoke the C
compiler, but clang-cl does not accept linker flags, so tests will fail to link.
The default is fine, so delete this line.

Signed-off-by: Kim Topley <b240e9af83531ac049af314c640f722869aeb57d@apple.com>

apple/swift-corelibs-libdispatch,apple/swift-corelibs-libdispatch,apple/swift-corelibs-libdispatch,apple/swift-corelibs-libdispatch