cmd/v: reimplement -path flag

vlib/os/os_nix.c.v

@@ -8,6 +8,7 @@ import strings
 
 pub const (
 	path_separator = '/'
+	path_delimiter = ':'
 )
 
 const (

vlib/os/os_windows.c.v

@@ -7,6 +7,7 @@ import strings
 
 pub const (
 	path_separator = '\\'
+	path_delimiter = ';'
 )
 
 // Ref - https://docs.microsoft.com/en-us/windows/desktop/winprog/windows-data-types

vlib/v/pref/pref.v

@@ -248,6 +248,11 @@ pub fn parse_args(args []string) (&Preferences, string) {
 				res.backend = b
 				i++
 			}
+			'-path' {
+				path := cmdline.option(current_args, '-path', '')
+				res.lookup_path = path.split(os.path_delimiter)
+				i++
+			}
 			else {
 				mut should_continue := false
 				for flag_with_param in list_of_flags_with_param {