Got basic code building with the roboRIO compiler.

Change-Id: I158caa4786542344e91949c62fd95a79015b653b
diff --git a/third_party/cddlib/BUILD b/third_party/cddlib/BUILD
index d197954..17a7fc4 100644
--- a/third_party/cddlib/BUILD
+++ b/third_party/cddlib/BUILD
@@ -1,5 +1,7 @@
 licenses(['notice'])
 
+load('/tools/build_rules/select', 'compiler_select')
+
 cc_library(
   name = 'cddlib',
   visibility = ['//visibility:public'],
@@ -24,5 +26,8 @@
     '-Wno-switch-enum',
     '-Wno-empty-body',
     '-Wno-sign-compare',
-  ],
+  ] + compiler_select({
+      'gcc': ['-Wno-unused-but-set-variable'],
+      'clang': []
+  }),
 )