patch 8.1.1985: code for dealing with paths is spread out

Problem:    Code for dealing with paths is spread out.
Solution:   Move path related functions from misc1.c to filepath.c.
            Remove NO_EXPANDPATH.

src/version.c

@@ -757,6 +757,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1985,
 /**/
     1984,
 /**/