Tests

build: set GGML_METAL_USE_BF16 option ON for metal build by default #530

Job	Run time
build-and-test (windows-latest, 3.13)	7m 32s
build-and-test (macos-14, 3.13, -DLLAMA_METAL=off, (No Metal))	3m 38s
build-and-test (macos-14, 3.9, -DLLAMA_METAL=off, (No Metal))	3m 52s
build-and-test (macos-14, 3.13, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	2m 29s
build-and-test (windows-latest, 3.9)	9m 7s
build-and-test (macos-14, 3.14, -DLLAMA_METAL=off, (No Metal))	3m 11s
build-and-test (ubuntu-latest, 3.9)	3m 6s
build-and-test (windows-latest, 3.14)	7m 35s
build-and-test (macos-14, 3.14, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBR...	3m 21s
build-and-test (ubuntu-latest, 3.14)	3m 11s
build-and-test (macos-14, 3.9, -DLLAMA_METAL=on -DGGML_METAL_USE_BF16=on -DGGML_METAL_EMBED_LIBRA...	3m 9s
build-and-test (ubuntu-latest, 3.13)	3m 5s
	53m 16s

Provide feedback