Move over to ABSL logging and flags.

Removes gperftools too since that wants gflags.

Here come the fireworks.

Change-Id: I79cb7bcf60f1047fbfa28bfffc21a0fd692e4b1c
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/frc971/vision/charuco_lib.h b/frc971/vision/charuco_lib.h
index aac25ee..e53d129 100644
--- a/frc971/vision/charuco_lib.h
+++ b/frc971/vision/charuco_lib.h
@@ -15,7 +15,7 @@
 #include "aos/network/message_bridge_server_generated.h"
 #include "frc971/vision/calibration_generated.h"
 
-DECLARE_bool(visualize);
+ABSL_DECLARE_FLAG(bool, visualize);
 
 namespace frc971::vision {