cmake: Remove unused property on some targets: LLVM_LINK_LIBS

[tstellar]

Summary

This doesn't appear to be used anywhere.

[serge-sans-paille]

git grep confirmed!

[tstellar]

Rebase.

llvm/cmake/modules/AddLLVM.cmake

else()
     # dependency information for this library through their name, and let
     # LLVMBuildResolveComponentsLink resolve the mapping.
     #
     # It would be nice to verify that we have the dependencies for this library
     # name, but using get_property(... SET) doesn't suffice to determine if a
     # property has been set to an empty value.
     set_property(TARGET ${name} PROPERTY LLVM_LINK_COMPONENTS ${ARG_LINK_COMPONENTS} ${LLVM_LINK_COMPONENTS})
 
-    # These two properties are internal properties only used to make sure the
+    # This property is an internal property only used to make sure the
     # link step applied in LLVMBuildResolveComponentsLink uses the same
-    # properties as the target_link_libraries call below.
-    set_property(TARGET ${name} PROPERTY LLVM_LINK_LIBS ${ARG_LINK_LIBS})
+    # property as the target_link_libraries call below.
     set_property(TARGET ${name} PROPERTY LLVM_LIBTYPE ${libtype})
   endif()
 
   target_link_libraries(${name} ${libtype}
       ${ARG_LINK_LIBS}
       ${lib_deps}
       ${llvm_libs}
       )