net/quagga: add three bugfixes from upstream

This change imports three post-1.2.4 release changes
from the primary Git repository of Quagga Project:

1. Fix threading error that broke ripd:

https://gogs.quagga.net/Quagga/quagga/commit/1f918980c08d9fb9215609db39f7fb279c2e1807

2. Fix memory corruption that may occur

when limit.rlim_cur is less then FD_SETSIZE:
https://gogs.quagga.net/Quagga/quagga/commit/b54de751ef72fa67749825a0ea30af7c22d575c5

3. Prevent queue corruption when removing the last entry of queues

https://gogs.quagga.net/Quagga/quagga/commit/e21719d8fa2b560d7cc9d1d9204bafee4984c577

PR: 261205
Approved by: pi (maintainer)