Remove magic-symbols-for-install-name.c from Accelerate CMakeLists.txt

This file exists on master but not on 5.1.

Author: stephentyrone

stdlib/public/Darwin/Accelerate/CMakeLists.txt

@@ -36,8 +36,6 @@ add_swift_target_library(swiftAccelerate ${SWIFT_SDK_OVERLAY_LIBRARY_BUILD_TYPES
   vDSP_SlidingWindow.swift
   vForce_Operations.swift
 
-  "${SWIFT_SOURCE_DIR}/stdlib/linker-support/magic-symbols-for-install-name.c"
-
   GYB_SOURCES
     BNNS.swift.gyb