chore: add .gitignore entries for OpenVINO support

[mochiya98]

Add .gitignore entries for OpenVINO support.
This eliminates unexpected diffs when using OpenVINO.

# added
models/*-encoder-openvino.xml
models/*-encoder-openvino-cache/

for

whisper.cpp/src/whisper.cpp

Lines 3367 to 3376 in cead8f5

	static std::string whisper_openvino_get_path_encoder(std::string path_bin) {
	auto pos = path_bin.rfind('.');
	if (pos != std::string::npos) {
	path_bin = path_bin.substr(0, pos);
	}
	path_bin += "-encoder-openvino.xml";
	return path_bin;
	}

whisper.cpp/src/whisper.cpp

Lines 3378 to 3388 in cead8f5

	static std::string whisper_openvino_get_path_cache(std::string path_bin) {
	auto pos = path_bin.rfind('.');
	if (pos != std::string::npos) {
	path_bin = path_bin.substr(0, pos);
	}
	path_bin += "-encoder-openvino-cache";
	return path_bin;
	}
	#endif