Expose pinned Expat headers to Zig Linux compiler adapters

build/linux-toolchain/zig-cross.py

@@ -67,7 +67,7 @@ def compiler(config, tool, incoming):
         "-F", config["sdk"] + "/System/Library/Frameworks", "-Wno-elaborated-enum-base",
     ] if "macos" in target else []
     if config.get('linux_abi_headers'):
-        args += ['-I' + config['linux_abi_headers']]
+        args += ['-idirafter', config['linux_abi_headers']]
     if config.get('linux_headers'):
         args += ['-idirafter', config['linux_headers'], '-idirafter', config['linux_headers'] + '/freetype2']
     if config.get('linux_sysroot') and '-c' not in incoming and '-o' in incoming:
@@ -252,7 +252,7 @@ def prepare(args):
         abi = output / 'include-linux'
         abi.mkdir(exist_ok=True)
         cpu = 'x86_64' if config['target'].startswith('x86_64') else 'aarch64'
-        for name in ('ffi.h', 'ffitarget.h'):
+        for name in ('ffi.h', 'ffitarget.h', 'expat.h', 'expat_external.h'):
             for prefix in (root / 'usr/include' / (cpu + '-linux-gnu'), root / 'usr/include'):
                 src = prefix / name
                 if src.is_file():