Chibios: disable LTO (link-time optimisation).

With LTO enabled, sometimes things fail for mysterious reasons
(e.g. bootloader jump on WF with LEDs enabled), just because the
linker optimisation is too aggressive.

Author: flabbergast

tool/chibios/chibios.mk

@@ -35,7 +35,7 @@ endif
 
 # Enable this if you want link time optimizations (LTO)
 ifeq ($(USE_LTO),)
-  USE_LTO = yes
+  USE_LTO = no
 endif
 
 # If enabled, this option allows to compile the application in THUMB mode.