Fix roborio reference in our armhf-debian toolchain

It's confusing.

Change-Id: I57c17a3da53fdd90385a993cd5338a01c15dfedb
diff --git a/tools/cpp/CROSSTOOL b/tools/cpp/CROSSTOOL
index bda3e1b..196912c 100644
--- a/tools/cpp/CROSSTOOL
+++ b/tools/cpp/CROSSTOOL
@@ -539,7 +539,7 @@
   abi_libc_version: "glibc_2.19"
   builtin_sysroot: ""
   compiler: "clang"
-  host_system_name: "roborio"
+  host_system_name: "linux"
   needsPic: true
   supports_gold_linker: false
   supports_incremental_linker: false