C++

lbfgs_search_strategy: Fix gcc 16 warning #1600

Job	Run time
ubuntu-22-04-gcc-default-cmake-3-17-ffmpeg5	26m 5s
ubuntu-22-04-ffmpeg711	1m 38s
ubuntu-latest-clang-default-avx	16m 50s
ubuntu-22-04-ffmpeg701	5m 23s
ubuntu-latest-gcc-11-blas	16m 9s
windows-latest	29m 12s
	1h 35m 17s

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