patch 8.1.2422: "make depend" does not work correctly for libvterm

Problem:    "make depend" does not work correctly for libvterm.
Solution:   Fix build dependencies. And a few minor improvements.
diff --git a/src/filepath.c b/src/filepath.c
index 0fc1a5c..01d2dcb 100644
--- a/src/filepath.c
+++ b/src/filepath.c
@@ -8,7 +8,7 @@
  */
 
 /*
- * filepath.c: dealing with file names ant paths.
+ * filepath.c: dealing with file names and paths.
  */
 
 #include "vim.h"