[test] Add a Radar to the tests I disabled in f869e9e.

I filed this under Radar rather than bugs.swift.org because it's /only/ our
CI system that's failing, and external contributors have no insight into
that anyway. Hopefully I'll be able to get to the bottom of this soon.

Author: jrose-apple

test/Driver/environment.swift

@@ -1,4 +1,5 @@
 // FIXME: This is failing on some of Apple's internal CI.
+// FIXME: <rdar://problem/23771412> Fix test/Driver/{environment.swift,options-interpreter.swift}
 // REQUIRES: disabled
 
 // RUN: %swift_driver -target x86_64-apple-macosx10.9 -L/foo/ -driver-use-frontend-path %S/Inputs/print-var.sh %s DYLD_LIBRARY_PATH | FileCheck %s

test/Driver/options-interpreter.swift

@@ -1,4 +1,5 @@
 // FIXME: This is failing on some of Apple's internal CI.
+// FIXME: <rdar://problem/23771412> Fix test/Driver/{environment.swift,options-interpreter.swift}
 // REQUIRES: disabled
 
 // RUN: not %swift_driver -deprecated-integrated-repl -emit-module 2>&1 | FileCheck -check-prefix=IMMEDIATE_NO_MODULE %s