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/constants/constants_sender_lib.h b/frc971/constants/constants_sender_lib.h
index 203435a..58da8d2 100644
--- a/frc971/constants/constants_sender_lib.h
+++ b/frc971/constants/constants_sender_lib.h
@@ -1,8 +1,9 @@
 #ifndef FRC971_CONSTANTS_CONSTANTS_SENDER_H_
 #define FRC971_CONSTANTS_CONSTANTS_SENDER_H_
 
-#include "gflags/gflags.h"
-#include "glog/logging.h"
+#include "absl/flags/flag.h"
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 
 #include "aos/events/event_loop.h"
 #include "aos/events/shm_event_loop.h"