tests/micropython/const.py: Add comment about required config for test.

jeongchanKim · dpgeorge · commit 19f09414a624 · 2021-11-17T14:28:20.000+11:00
Expected result of const.py will be matched only when MICROPY_COMP_CONST is
enabled.  For easy understanding, added description at the first of the
test code.
diff --git a/tests/micropython/const.py b/tests/micropython/const.py
@@ -1,4 +1,5 @@
 # test constant optimisation
+# This test will only work when MICROPY_COMP_CONST is enabled.
 
 from micropython import const
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,5 @@`
`1`	`1`	`# test constant optimisation`
	`2`	`+# This test will only work when MICROPY_COMP_CONST is enabled.`
`2`	`3`
`3`	`4`	`from micropython import const`
`4`	`5`