'-Wincompatible-pointer-types' diagnostics cause build failure with GCC 14

[Leo3418]

Several files' compilation will trigger -Wincompatible-pointer-types diagnostics. This will prevent the project from being successfully built on Fedora 40 and other GNU/Linux distributions that use GCC 14 because, on GCC 14, -Wincompatible-pointer-types is treated as an error rather than a warning.

Steps to reproduce:

1. Clone this repository and enter the directory that contains the clone.
2. If gcc --version reports GCC 14 or above, then run meson setup build; Otherwise, run CFLAGS="-Werror=incompatible-pointer-types" meson setup build.
3. Run meson compile -C build.

build.log