patch 8.2.4905: codecov includes MS-Windows install header file

Problem:    codecov includes MS-Windows install header file.
Solution:   Ignore dosinst.h.

.codecov.yml

@@ -8,4 +8,5 @@ coverage:
 # Files not run by tests
 ignore:
   - "src/dosinst.c"
+  - "src/dosinst.h"
   - "src/uninstall.c"

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4905,
 /**/
     4904,
 /**/