Don't use magic-symbols-for-install-name as per review feedback

Author: edymtt

stdlib/public/Concurrency/CMakeLists.txt

@@ -13,7 +13,6 @@
 add_swift_target_library(swift_Concurrency ${SWIFT_STDLIB_LIBRARY_BUILD_TYPES} IS_STDLIB
   Actor.swift
   PartialAsyncTask.swift
-  "${SWIFT_SOURCE_DIR}/stdlib/linker-support/magic-symbols-for-install-name.c"
 
   SWIFT_MODULE_DEPENDS_OSX Darwin
   SWIFT_MODULE_DEPENDS_IOS Darwin

stdlib/public/Differentiation/CMakeLists.txt

@@ -17,7 +17,6 @@ add_swift_target_library(swift_Differentiation ${SWIFT_STDLIB_LIBRARY_BUILD_TYPE
   AnyDifferentiable.swift
   ArrayDifferentiation.swift
   OptionalDifferentiation.swift
-  "${SWIFT_SOURCE_DIR}/stdlib/linker-support/magic-symbols-for-install-name.c"
 
   GYB_SOURCES
     FloatingPointDifferentiation.swift.gyb