Compare "GGUF" with file header char by char #4

Job	Run time
macOS-latest-cmake-ios	1m 10s
macOS-latest-cmake	1m 55s
macOS-latest-cmake-tvos	1m 7s
macOS-latest-make	1m 56s
macOS-latest-swift (generic/platform=macOS)	1m 0s
ubuntu-focal-make	1m 48s
ubuntu-latest-cmake	1m 33s
macOS-latest-swift (generic/platform=iOS)	1m 40s
ubuntu-latest-cmake-mpi (mpich)	2m 3s
macOS-latest-swift (generic/platform=tvOS)	1m 44s
ubuntu-latest-cmake-mpi (libopenmpi-dev)	1m 45s
ubuntu-latest-cmake-sanitizer (ADDRESS, Debug)	2m 35s
windows-latest-cmake (noavx, -DLLAMA_NATIVE=OFF -DLLAMA_BUILD_SERVER=ON -DLLAMA_AVX=OFF -DLLAMA_A...	2m 55s
ubuntu-latest-cmake-sanitizer (ADDRESS, Release)	3m 25s
ubuntu-latest-cmake-sanitizer (THREAD, Debug)	6m 4s
windows-latest-cmake-cublas (12.2.0, cublas)	25m 35s
windows-latest-cmake (avx2, -DLLAMA_NATIVE=OFF -DLLAMA_BUILD_SERVER=ON -DBUILD_SHARED_LIBS=ON)	3m 25s
windows-latest-cmake-cublas (11.7.1, cublas)	21m 39s
ubuntu-latest-cmake-sanitizer (THREAD, Release)	4m 7s
windows-latest-cmake (avx, -DLLAMA_NATIVE=OFF -DLLAMA_BUILD_SERVER=ON -DLLAMA_AVX2=OFF -DBUILD_SH...	3m 10s
ubuntu-latest-cmake-sanitizer (UNDEFINED, Debug)	2m 20s
windows-latest-cmake (avx512, -DLLAMA_NATIVE=OFF -DLLAMA_BUILD_SERVER=ON -DLLAMA_AVX512=ON -DBUIL...	3m 30s
ubuntu-latest-cmake-sanitizer (UNDEFINED, Release)	5m 36s
windows-latest-cmake (clblast, -DLLAMA_NATIVE=OFF -DLLAMA_BUILD_SERVER=ON -DLLAMA_CLBLAST=ON -DBU...	3m 14s
windows-latest-cmake (openblas, -DLLAMA_NATIVE=OFF -DLLAMA_BUILD_SERVER=ON -DLLAMA_BLAS=ON -DBUIL...	3m 35s
release	49s
	1h 49m 40s

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