Revert "cmake: Ensure that CMAKE_CODESIGN is set instead of trying to run empty"

This reverts commit f3b7485.

Author: Doug Coleman

benchmark/cmake/modules/AddSwiftBenchmarkSuite.cmake

@@ -321,7 +321,6 @@ function (swift_benchmark_compile_archopts)
         "-c"
         "-o" "${objcfile}")
 
-  precondition(CMAKE_CODESIGN MESSAGE "CMAKE_CODESIGN is required, please set it")
   add_custom_command(
       OUTPUT "${OUTPUT_EXEC}"
       DEPENDS

cmake/modules/AddSwift.cmake

@@ -465,7 +465,6 @@ function(_add_swift_lipo_target)
   is_darwin_based_sdk("${LIPO_SDK}" IS_DARWIN)
   if(IS_DARWIN)
     if(LIPO_CODESIGN)
-      precondition(CMAKE_CODESIGN MESSAGE "CMAKE_CODESIGN is required, please set it")
       set(codesign_command COMMAND "${CMAKE_CODESIGN}" "-f" "-s" "-" "${LIPO_OUTPUT}")
     endif()
     # Use lipo to create the final binary.