Install 32bit Firebird server on x86

php_pdo_firebird.dll depends on fbclient.dll, which is shipped with the
server.  However, a 64bit Firebird server ships a 64bit fbclient.dll,
which is not compatible with a 32bit php_pdo_firebird.dll.

Closes GH-16223.

Author: cmb69

.github/scripts/windows/test_task.bat

@@ -52,7 +52,12 @@ set ODBC_TEST_DSN=Driver={ODBC Driver 17 for SQL Server};Server=^(local^)\SQLEXP
 set PDOTEST_DSN=odbc:%ODBC_TEST_DSN%
 
 rem setup Firebird related exts
-curl -sLo Firebird.zip https://github.com/FirebirdSQL/firebird/releases/download/v3.0.9/Firebird-3.0.9.33560-0_x64.zip
+if "%PLATFORM%" == "x64" (
+	set PHP_FIREBIRD_DOWNLOAD_URL=https://github.com/FirebirdSQL/firebird/releases/download/v3.0.9/Firebird-3.0.9.33560-0_x64.zip
+) else (
+	set PHP_FIREBIRD_DOWNLOAD_URL=https://github.com/FirebirdSQL/firebird/releases/download/v3.0.9/Firebird-3.0.9.33560-0_Win32.zip
+)
+curl -sLo Firebird.zip %PHP_FIREBIRD_DOWNLOAD_URL%
 7z x -oC:\Firebird Firebird.zip
 set PDO_FIREBIRD_TEST_DATABASE=C:\test.fdb
 set PDO_FIREBIRD_TEST_DSN=firebird:dbname=%PDO_FIREBIRD_TEST_DATABASE%