patch 8.2.0930: script filetype detection trips over env -S argument

Problem:    Script filetype detection trips over env -S argument.
Solution:   Remove "-S" and "--ignore-environment". (closes #5013)
            Add tests.
diff --git a/src/version.c b/src/version.c
index 3015f8f..e446a7b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    930,
+/**/
     929,
 /**/
     928,