patch 8.2.4904: codecov includes MS-Windows install files

Problem:    codecov includes MS-Windows install files.
Solution:   Ignore dosinst.c and uninstall.c.

.codecov.yml

@@ -4,3 +4,8 @@ coverage:
     project:
       default:
         threshold: 0.05%
+
+# Files not run by tests
+ignore:
+  - "src/dosinst.c"
+  - "src/uninstall.c"

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4904,
 /**/
     4903,
 /**/