chore(llama-ggml): drop deprecated backend

The GGML format is now dead, since in the next version of LocalAI we
already bring many breaking compatibility changes, taking the occasion
also to drop ggml support (pre-gguf).

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

pkg/model/initializers.go

@@ -43,8 +43,6 @@ var TypeAlias map[string]string = map[string]string{
 var AutoDetect = os.Getenv("DISABLE_AUTODETECT") != "true"
 
 const (
-	LlamaGGML = "llama-ggml"
-
 	LLamaCPP = "llama-cpp"
 
 	LLamaCPPAVX2     = "llama-cpp-avx2"
@@ -143,10 +141,10 @@ func orderBackends(backends map[string][]string) ([]string, error) {
 
 	// sets a priority list - first has more priority
 	priorityList := []string{
-		// First llama.cpp(variants) and llama-ggml to follow.
+		// First llama.cpp(variants)
 		// We keep the fallback to prevent that if the llama.cpp variants
 		// that depends on shared libs if breaks have still a safety net.
-		LLamaCPP, LlamaGGML, LLamaCPPFallback,
+		LLamaCPP, LLamaCPPFallback,
 	}
 
 	toTheEnd := []string{