waf: disable use of libc realloc for chibios

Tools/ardupilotwaf/boards.py

@@ -442,6 +442,7 @@ class chibios(Board):
         env.DEFINES.update(
             CONFIG_HAL_BOARD = 'HAL_BOARD_CHIBIOS',
             HAVE_STD_NULLPTR_T = 0,
+            USE_LIBC_REALLOC = 0,
         )
 
         env.AP_LIBRARIES += [
@@ -494,6 +495,7 @@ class chibios(Board):
             '-specs=nosys.specs',
             '-DCHIBIOS_BOARD_NAME="%s"' % self.name,
             '-D__USE_CMSIS',
+            '-Werror=deprecated-declarations'
         ]
         env.CXXFLAGS += env.CFLAGS + [
             '-fno-rtti',