WSL kernel does not build with gcc 15

### Windows Version

irrelevant

### WSL Version

irrelevant

### Are you using WSL 1 or WSL 2?

- [x] WSL 2
- [ ] WSL 1

### Kernel Version

6.6.87.2-microsoft-standard-WSL2

### Distro Version

archlinux

### Other Software

_No response_

### Repro Steps

Compile linux kernel according to steps described in WSL2-Linux-Kernel using gcc 15.

### Expected Behavior

The kernel should compile with gcc 15.

### Actual Behavior

The kernel fails to compile due to kernel's incompatibility with c23(which gcc 15 defaults to)'s `bool` type as well as `true`, `false` identifiers.

### Diagnostic Logs