Allow to set a SetLibrarySearchPath in the golang bindings (#981)

This is used to identify the path where all the various implementations
are

gpt4all-bindings/golang/options.go

@@ -24,7 +24,8 @@ var DefaultModelOptions ModelOptions = ModelOptions{
 }
 
 type ModelOptions struct {
-	Threads int
+	Threads           int
+	LibrarySearchPath string
 }
 type ModelOption func(p *ModelOptions)
 
@@ -100,6 +101,13 @@ func SetThreads(c int) ModelOption {
 	}
 }
 
+// SetLibrarySearchPath sets the dynamic libraries used by gpt4all for the various ggml implementations.
+func SetLibrarySearchPath(t string) ModelOption {
+	return func(p *ModelOptions) {
+		p.LibrarySearchPath = t
+	}
+}
+
 // Create a new PredictOptions object with the given options.
 func NewModelOptions(opts ...ModelOption) ModelOptions {
 	p := DefaultModelOptions