patch 9.0.2033: gcc overflow-warning for f_resolve

Problem:  gcc overflow-warning for f_resolve
Solution: use pointer p instead of pointer q[-1]

Suppress the following warning:
```
filepath.c: In function ‘f_resolve’:
filepath.c:2162:27: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
 2162 |                     q[-1] = NUL;
```

Closes: #13352
closes: #13353

Signed-off-by: Christian Brabandt <[email protected]>
Co-authored-by: Ken Takata <[email protected]>

Author: k-takata

src/filepath.c

@@ -2159,7 +2159,7 @@ f_resolve(typval_T *argvars, typval_T *rettv)
 		if (q > p && *q == NUL)
 		{
 		    // Ignore trailing path separator.
-		    q[-1] = NUL;
+		    p[q - p - 1] = NUL;
 		    q = gettail(p);
 		}
 		if (q > p && !mch_isFullName(buf))

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2033,
 /**/
     2032,
 /**/