Log message:
Pullup ticket #6410 - requested by kardel
net/frr: build fix

Revisions pulled up:
- net/frr/Makefile                                              1.3-1.4

---
   Module Name:    pkgsrc
   Committed By:   kardel
   Date:           Wed Jan  6 10:45:49 UTC 2021

   Modified Files:
           pkgsrc/net/frr: Makefile

   Log message:
   net/frr: document bison tool dependency

---
   Module Name:    pkgsrc
   Committed By:   kardel
   Date:           Wed Jan  6 11:53:52 UTC 2021

   Modified Files:
           pkgsrc/net/frr: Makefile

   Log message:
   net/frr: simplify bison tool requirement