Fix warning about used args in GolangFlyweightGenerator. #1182

Job	Run time
C++ Xcode (macOS)	1m 8s
C++ GCC 6 (Ubuntu 20.04)	1m 34s
C++ Clang 9 (Ubuntu 20.04)	1m 50s
C++ GCC 7 (Ubuntu 20.04)	1m 37s
C++ Clang 13 (Ubuntu 24.04)	1m 43s
C++ Clang 10 (Ubuntu 20.04)	1m 48s
C++ GCC 8 (Ubuntu 20.04)	1m 32s
C++ GCC 11 (Ubuntu 24.04)	1m 43s
C++ Clang 11 (Ubuntu 20.04)	1m 47s
C++ Clang 14 (Ubuntu 24.04)	1m 47s
C++ GCC 9 (Ubuntu 20.04)	1m 37s
C++ Clang 12 (Ubuntu 20.04)	1m 42s
C++ Clang 15 (Ubuntu 24.04)	1m 34s
C++ GCC 12 (Ubuntu 24.04)	1m 46s
C++ GCC 10 (Ubuntu 20.04)	1m 32s
C++ Clang 16 (Ubuntu 24.04)	1m 24s
C++ GCC 13 (Ubuntu 24.04)	1m 38s
C++ Clang 17 (Ubuntu 24.04)	1m 21s
C++ GCC 14 (Ubuntu 24.04)	1m 40s
C++ MSVC (Windows) (windows-latest)	5m 15s
C++ Clang 18 (Ubuntu 24.04)	1m 44s
C# 8.0.x	2m 48s
Golang 1.22.x	1m 27s
Java 17 (ubuntu-24.04)	1m 46s
Rust stable	1m 1s
Java 17 (windows-latest)	4m 4s
Rust beta	1m 4s
Java 17 (macos-latest)	1m 17s
Rust nightly	1m 4s
Java 21 (ubuntu-24.04)	1m 48s
Java 21 (windows-latest)	5m 3s
Java 21 (macos-latest)	2m 47s
	1h 1m 51s

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