Merge pull request swiftlang#30846 from apple/revert-30020-link_flags

Revert "[build] Don't reset 'swiftlib_link_flags_all' unnecessarily"

Author: nkcsgexi

stdlib/cmake/modules/AddSwiftStdlib.cmake

@@ -1430,6 +1430,7 @@ function(add_swift_target_library name)
 
       # Add PrivateFrameworks, rdar://28466433
       set(swiftlib_c_compile_flags_all ${SWIFTLIB_C_COMPILE_FLAGS})
+      set(swiftlib_link_flags_all ${SWIFTLIB_LINK_FLAGS})
 
       # Add flags to prepend framework search paths for the parallel framework
       # hierarchy rooted at /System/iOSSupport/...