APPS: Replace 'OPT_ERR = -1, OPT_EOF = 0, OPT_HELP' by OPT_COMMON macro

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15111)

apps/nseq.c

diff --git a/apps/nseq.c b/apps/nseq.c
index 706ca58f..8848e89 100644
--- a/apps/nseq.c
+++ b/apps/nseq.c
@@ -15,7 +15,7 @@
 #include <openssl/err.h>
 
 typedef enum OPTION_choice {
-    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,
+    OPT_COMMON,
     OPT_TOSEQ, OPT_IN, OPT_OUT,
     OPT_PROV_ENUM
 } OPTION_CHOICE;