Describe the bug
Meson gives an erroneous warning about the output file for configure_file() being overwritten if multiple configure_file() calls are being made from the same directory with the same output file name, but different build_subdir settings. In this case, the output files are not being overwritten because they are being created in different subdirectories.

To Reproduce
meson.build:

project('test', meson_version: '>=1.10')

foreach arg : ['hello', 'world']
    configure_file(
        build_subdir: arg,
        output: 'file',
        configuration: {'key': 'value'},
    )
endforeach

Expected behavior
No such warning to be emitted.

system parameters

• Is this a cross build or just a plain native build (for the same computer)? Both
• what operating system (e.g. MacOS Catalina, Windows 10, CentOS 8.0, Ubuntu 18.04, etc.): WSL Ubuntu 24.04.3 LTS
• what Python version are you using e.g. 3.8.0: 3.12.3
• what meson --version: 1.10.1
• what ninja --version if it's a Ninja build: 1.11.1