Add WSL Woodpecker cross-build test and prefer bundled headers

build/linux-toolchain/zig-cross.py

@@ -69,7 +69,7 @@ def compiler(config, tool, incoming):
     if config.get('linux_abi_headers'):
         args += ['-I' + config['linux_abi_headers']]
     if config.get('linux_headers'):
-        args += ['-I' + config['linux_headers'], '-I' + config['linux_headers'] + '/freetype2']
+        args += ['-idirafter', config['linux_headers'], '-idirafter', config['linux_headers'] + '/freetype2']
     if config.get('linux_sysroot') and '-c' not in incoming and '-o' in incoming:
         root = Path(config['linux_sysroot'])
         cpu = 'x86_64' if target.startswith('x86_64') else 'aarch64'