Make vscode's debugger work with the sysroot

The debugger was finding files which didn't exist in the sandbox, but
existed in the sysroot.  This was causing all sorts of confusion.

Fix this by cleaning up the sandbox.

Change-Id: I990d1a531fc7999c2262cff9409d33e03578d0fa
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/frc971/amd64/build_rootfs.py b/frc971/amd64/build_rootfs.py
index cc0138e..49735c8 100755
--- a/frc971/amd64/build_rootfs.py
+++ b/frc971/amd64/build_rootfs.py
@@ -165,6 +165,10 @@
         "--exclude=./usr/bin/X11",
         "--exclude=./usr/lib/systemd/system/system-systemd*cryptsetup.slice",
         "--exclude=./dev",
+        "--exclude=./usr/include/cub",
+        "--exclude=./usr/include/nv",
+        "--exclude=./usr/include/thrust",
+        "--exclude=./usr/include/cuda",
         "-cf",
         tarball,
         ".",