Log Message:
Pullup ticket #5290 (second part) - requested by sevan
www/nginx: build fix

Revisions pulled up:
- www/nginx/options.mk                                          1.38

---
   Module Name:    pkgsrc
   Committed By:   maya
   Date:           Sat Apr 15 06:26:51 UTC 2017

   Modified Files:
           pkgsrc/www/nginx: options.mk

   Log Message:
   Use PKG_OPTIONS_LEGACY_OPTS for renaming v2->http2

   so existing users won't need to modify their configs