fix(xlswriter): convert K&R function declaration to ANSI C in bundled minizip

The bundled minizip in xlswriter (pinned at libxlsxwriter RELEASE_1.0.0)
uses a K&R-style function declaration in mztools.c. Modern Clang on macOS
(defaulting to C23) rejects this as a hard syntax error since K&R
declarations were removed from the C23 standard.

The upstream libxlsxwriter has already fixed this on their main branch.
This patch applies the same fix during the build process.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/SPC/builder/extension/xlswriter.php

@@ -5,6 +5,7 @@ declare(strict_types=1);
 namespace SPC\builder\extension;
 
 use SPC\builder\Extension;
+use SPC\store\FileSystem;
 use SPC\store\SourcePatcher;
 use SPC\util\CustomExt;
 
@@ -28,6 +29,18 @@ class xlswriter extends Extension
     public function patchBeforeMake(): bool
     {
         $patched = parent::patchBeforeMake();
+
+        // Fix K&R C function declaration in bundled minizip rejected by modern Clang (C23 default)
+        $mztools = $this->source_dir . '/library/libxlsxwriter/third_party/minizip/mztools.c';
+        if (file_exists($mztools)) {
+            FileSystem::replaceFileStr(
+                $mztools,
+                "extern int ZEXPORT unzRepair(file, fileOut, fileOutTmp, nRecovered, bytesRecovered)\nconst char* file;\nconst char* fileOut;\nconst char* fileOutTmp;\nuLong* nRecovered;\nuLong* bytesRecovered;\n{",
+                "extern int ZEXPORT unzRepair(const char* file, const char* fileOut, const char* fileOutTmp, uLong* nRecovered, uLong* bytesRecovered)\n{"
+            );
+            $patched = true;
+        }
+
         if (PHP_OS_FAMILY === 'Windows') {
             // fix windows build with openssl extension duplicate symbol bug
             SourcePatcher::patchFile('spc_fix_xlswriter_win32.patch', $this->source_dir);