gcc: amend __FILE__ mangling patch to only affect `-fmacro-prefix-map=`

THe initial intent of the change was to only affect
`-fmacro-prefix-map=` option.

Due to the bug of `if (maps == macro_prefix_maps)` condition of initial
setting all three of:

    static file_prefix_map *macro_prefix_maps; /* -fmacro-prefix-map  */
    static file_prefix_map *debug_prefix_maps; /* -fdebug-prefix-map  */
    static file_prefix_map *profile_prefix_maps; /* -fprofile-prefix-map  */

matches the comparison and applied the mangling (as long as on options
were passed into those before).

As a result not only (intended) `__FILE__` embedding happened in `.data`
section, but also (unintended) debugging symbols (`-fdebug-prefix-map`)
and profiling data (`-fprofile-prefix-map`) were broken by mangling.

The patch update fixes it by explicitly passing a boolean that controls
the mangling in a single call site relevant to `-fmacro-prefix-map`.

While at it fixed `int / size_t` mismatch that caused build failure on
upcoming `gcc-14`.

Tested as:

- `nix` still has no `nlohmann_json` retention
- `gdb` can now resolve `stdc++` debugging symbols in templates
- `--coverage` has working source file paths

0 files changed, 0 insertions, 0 deletions