build: remove unnecessary `find_package`
Now that we link using the swift driver, we no longer need to explicitly
add in the path to the swift registrar.  Remove the unncessary
`find_package` to make it easier to build libdispatch.
@@ -55,8 +55,6 @@ if(ENABLE_SWIFT)
message(FATAL_ERROR "CMAKE_SWIFT_COMPILER must be defined to enable swift")
endif()
- find_package(Swift REQUIRED CONFIG)
-
string(TOLOWER ${CMAKE_SYSTEM_NAME} swift_os)
get_swift_host_arch(swift_arch)
