[PATCH v2 0/1] MR7139: configure: Use per-architecture cross flags if they are provided.

[Rémi Bernon]

If `<arch>_CFLAGS`/`<arch>_LDFLAGS` are passed to configure they are ignored and replaced with the default flags. This prefers the user-provided flags if any, and falls back to `CROSSCFLAGS` / `CROSSLDLAGS` then to the default flags.

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  v2: configure: Use per-architecture cross flags if they are provided.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7139