windows: always use curl's basename() implementation

The `basename()` [1][2] implementation provided by mingw-w64 [3] makes
assumptions about input encoding and may break with non-ASCII strings.

`basename()` was auto-detected with CMake, autotools and since
68fa9bf3f5d7b4fcbb57619f70cb4aabb79a51f6 (2022-10-13), also in
`Makefile.mk` after syncing its behaviour with the mainline build
methods. A similar patch for curl-for-win broke official Windows
builds earlier, in release 7.83.1_4 (2022-06-15).

This patch forces all Windows builds to use curl's internal
`basename()` implementation to avoid such problems.

[1]: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/basename.html
[2]: https://www.man7.org/linux/man-pages/man3/basename.3.html
[3]: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/master/tree/mingw-w64-crt/misc/basename.c

Reported-by: UnicornZhang on Github
Assisted-by: Cherish98 on Github
Reviewed-by: Daniel Stenberg

Fixes #10261
Closes #10475

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