fix issue: no member named create_gpu_instance in namespace ncnn #5471
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This PR is intent to fix following issue:
This issue could be reproduced very easily with official release pkg ncnn-20240410-android-vulkan.zip.
the root-cause is that NCNN_VULKAN was defined/hard-coded by CMake build script and many NCNN's internal codes heavily depend on the pre-defined/hard-coded NCNN_VULKAN, but some NCNN GPU APIs(such as create_gpu_instance, destroy_gpu_instance, get_gpu_count...) would be called in user's code even the scenario is pure CPU inference.