Fix Windows Clang build on PHP 8.5

--with-toolset=clang was missing.

Author: iluuu1994

.github/scripts/windows/build_task.bat

@@ -26,6 +26,7 @@ if %errorlevel% neq 0 exit /b 3
 if "%THREAD_SAFE%" equ "0" set ADD_CONF=%ADD_CONF% --disable-zts
 if "%INTRINSICS%" neq "" set ADD_CONF=%ADD_CONF% --enable-native-intrinsics=%INTRINSICS%
 if "%ASAN%" equ "1" set ADD_CONF=%ADD_CONF% --enable-sanitizer --enable-debug-pack
+if "%CLANG_TOOLSET%" equ "1" set ADD_CONF=%ADD_CONF% --with-toolset=clang
 
 rem C4018: comparison: signed/unsigned mismatch
 rem C4146: unary minus operator applied to unsigned type