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/wpilib/fpga_time_conversion.h b/frc971/wpilib/fpga_time_conversion.h
index c279089..af80321 100644
--- a/frc971/wpilib/fpga_time_conversion.h
+++ b/frc971/wpilib/fpga_time_conversion.h
@@ -4,7 +4,8 @@
 #include <chrono>
 #include <optional>
 
-#include "glog/logging.h"
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 
 #include "aos/time/time.h"
 #include "hal/cpp/fpga_clock.h"