Change #ifdef markers around lockdown and SpringBoard
calls to dpeend on WITH_SPRINGBOARD and WITH_LOCKDOWN
instead of __arm__.  Add an RNBSocket::useFD method.

llvm-svn: 151119
diff --git a/lldb/tools/debugserver/source/DNBError.h b/lldb/tools/debugserver/source/DNBError.h
index 10c6638..78b2c8b 100644
--- a/lldb/tools/debugserver/source/DNBError.h
+++ b/lldb/tools/debugserver/source/DNBError.h
@@ -28,7 +28,7 @@
         Generic = 0,
         MachKernel,
         POSIX
-#if defined (__arm__)
+#ifdef WITH_SPRINGBOARD
         , SpringBoard
 #endif
     } FlavorType;