internal/driver: allow local symbolization with perf path format (#335)

internal/driver/fetch.go

 				if matches, err := filepath.Glob(filepath.Join(path, m.BuildID, "*")); err == nil {
 					fileNames = append(fileNames, matches...)
 				}
+				fileNames = append(fileNames, filepath.Join(path, m.File, m.BuildID)) // perf path format
 			}
 			if m.File != "" {
 				// Try both the basename and the full path, to support the same directory