master updated (7a13ddf -> 28fcdb5)

[Alan Third]

athird pushed a change to branch master.

      from  7a13ddf   Update a few more IRC-related references to point to 
Libera.Chat
       new  604133e   Fix thread memory management under NS
       new  0382aa1   Remove unused variables
       new  28fcdb5   Fix crash in GNUstep font coverage check


Summary of changes:
 src/nsfont.m | 44 +++++++++++++++++++++++++-------------------
 src/nsterm.m |  6 +-----
 src/thread.c | 17 +++++++++++++++++
 3 files changed, 43 insertions(+), 24 deletions(-)