python: Remove Python 2-only -t CLI flag in makefile

`-t` was used in Python 2 to warn if a file was mixing spaces and tabs such as a valid syntax would depend on the number of spaces a tab is worth. It doesn’t exist anymore since Python 3.0

include/Make/Python.make

@@ -2,4 +2,4 @@
 PY_SOURCES := $(wildcard *.py)
 
 %.pyc: %.py
-	$(PYTHON) -t -m py_compile $<
+	$(PYTHON) -m py_compile $<