switched from fitpc/atom to prime/linux

Also removed a few old things that had nothing reasonable to be changed
to.
diff --git a/frc971/control_loops/index/index.gyp b/frc971/control_loops/index/index.gyp
index 014f266..dc1c06d 100644
--- a/frc971/control_loops/index/index.gyp
+++ b/frc971/control_loops/index/index.gyp
@@ -60,7 +60,7 @@
         'index_main.cc',
       ],
       'dependencies': [
-        '<(AOS)/atom_code/atom_code.gyp:init',
+        '<(AOS)/linux_code/linux_code.gyp:init',
         'index_lib',
         'index_loop',
       ],