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/control_loops/runge_kutta.h b/frc971/control_loops/runge_kutta.h
index 173014e..7f2b6b6 100644
--- a/frc971/control_loops/runge_kutta.h
+++ b/frc971/control_loops/runge_kutta.h
@@ -1,7 +1,8 @@
 #ifndef FRC971_CONTROL_LOOPS_RUNGE_KUTTA_H_
 #define FRC971_CONTROL_LOOPS_RUNGE_KUTTA_H_
 
-#include "glog/logging.h"
+#include "absl/log/check.h"
+#include "absl/log/log.h"
 #include <Eigen/Dense>
 
 #include "frc971/control_loops/runge_kutta_helpers.h"