Remove redundant declarations

[cepetr]

These changes are required to enable -Wredundant-decls in the firmware repository (trezor/trezor-firmware#7698).

• Removes redundant external declarations of modules from builtin.h, which are also declared in py/objmodule.h (imported from genhdr/)
• Removes redundant declarations of VFS functions from builtin.h. Since vfs.h cannot be included in builtin.h due to a circular dependency, a slightly larger refactoring was needed
• Modifies how mp_hal_delay_us is defined to remove the redundant declaration warning. It is now consistent with other declarations in mphalport.h

This fix doesn't resolve all redundant declarations in the MicroPython code, just those that affect us.

[Copilot]

Pull request overview

This PR removes redundant declarations to allow enabling -Wredundant-decls, primarily by shifting VFS-related declarations/wrappers out of py/builtin.h and aligning module declarations with py/objmodule.h.

Changes:

• Removes redundant module and VFS-related declarations from py/builtin.h, relying on py/objmodule.h for module externs.
• Refactors VFS import stat and built-in open() plumbing by adding wrappers in .c files (avoiding including vfs.h from builtin.h).
• Adjusts mp_hal_delay_us definition in the Unix port header to avoid redundant declaration warnings.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
py/parse.c	Includes py/objmodule.h to pick up module externs previously provided via py/builtin.h.
py/modbuiltins.c	Adds VFS header include and a VFS-to-builtin open() adapter function/object when MICROPY_VFS is enabled.
py/builtinimport.c	Adds VFS header include and a VFS-backed mp_import_stat implementation when MICROPY_VFS is enabled.
py/builtin.h	Removes redundant VFS/module declarations to eliminate -Wredundant-decls triggers.
ports/unix/mphalport.h	Defines mp_hal_delay_us as a self-referential macro before the inline definition to suppress redundant prototypes from py/mphal.h.

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[mmilata]

LGTM but please fix author of the last commit

Author: nobody <nobody@satoshilabs.com>