Build failed on macos

[star-hengxing]

  Target "dispatch" links to:

    BlocksRuntime::BlocksRuntime

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Why?

swift-corelibs-libdispatch/src/CMakeLists.txt

Lines 153 to 154 in 0bb6c10

	target_link_libraries(dispatch PUBLIC
	BlocksRuntime::BlocksRuntime)