Andrew Leech b603fa38b2 py/mkrules.mk: Reset USER_C_MODULES when building mpy-cross dependency. ...

When a port automatically compiles `mpy-cross`, if `USER_C_MODULES` is
provided by the user on the command line then it is also applied to the
`mpy-cross` build.  That can lead to build errors if the path is relative
and not found when building `mpy-cross`.

Fix that by explicitly resetting `USER_C_MODULES` when invoking the
`mpy-cross` build.

Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>

2025-02-07 17:24:43 +11:00

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