Add optional $UNIX_TIME variable to build environment

platformio/builder/scripts/teensy.py

@@ -5,7 +5,6 @@
     Builder for Teensy boards
 """
 
-import time
 from os.path import isfile, join
 from random import randint
 
@@ -76,10 +75,6 @@ elif env.get("BOARD_OPTIONS", {}).get("build", {}).get("core") == "teensy3":
             # "-nostdlib"
         ],
 
-        CPPDEFINES=[
-            "TIME_T=%d" % time.time()
-        ],
-
         LINKFLAGS=[
             "-mcpu=cortex-m4",
             "-mthumb",