Hide empty terminal window (#8668)

This hides the LlamaServer blank window when chatting outside of the terminal (say like with an app like Msty). This has no other side effects when invoking it the regular way.

llm/llm_windows.go

@@ -7,6 +7,7 @@ import (
 const (
 	CREATE_DEFAULT_ERROR_MODE   = 0x04000000
 	ABOVE_NORMAL_PRIORITY_CLASS = 0x00008000
+       CREATE_NO_WINDOW            = 0x08000000
 )
 
 var LlamaServerSysProcAttr = &syscall.SysProcAttr{
@@ -18,5 +19,5 @@ var LlamaServerSysProcAttr = &syscall.SysProcAttr{
 	//
 	// Setting Above Normal priority class ensures when running as a "background service"
 	// with "programs" given best priority, we aren't starved of cpu cycles
-	CreationFlags: CREATE_DEFAULT_ERROR_MODE | ABOVE_NORMAL_PRIORITY_CLASS,
+	CreationFlags: CREATE_DEFAULT_ERROR_MODE | ABOVE_NORMAL_PRIORITY_CLASS | CREATE_NO_WINDOW,
 }