Set the default install_name_dir for dylibs to /usr/lib/swift on Apple platforms (except for XCTest).

Author: Ross Bayer

CMakeLists.txt

@@ -253,7 +253,7 @@ option(SWIFT_RUNTIME_CRASH_REPORTER_CLIENT
 set(SWIFT_DARWIN_XCRUN_TOOLCHAIN "XcodeDefault" CACHE STRING
     "The name of the toolchain to pass to 'xcrun'")
 
-set(SWIFT_DARWIN_STDLIB_INSTALL_NAME_DIR "@rpath" CACHE STRING
+set(SWIFT_DARWIN_STDLIB_INSTALL_NAME_DIR "/usr/lib/swift" CACHE STRING
     "The directory of the install_name for standard library dylibs")
 
 set(SWIFT_DARWIN_DEPLOYMENT_VERSION_OSX "10.9" CACHE STRING