Log Message:
Update www/links{,gui} to links-{,gui-}2.10.
From Leo Taccari in PR 50072.

pkgsrc changes:
o Convert all the old links-xz and links-zlib options to lzma and zlib2.
o Do not include the bzip2, xz and zlib buildlink3.mk files: they are
  handled in www/links/options.mk.
o Add "svg" option for links-gui (disabled by default) to reflect
  upstream change.

Changes:
o Fix "Counld not assing boundary" bug when posting a form
  The bug was found by Greg Cook
o SVG support using the rsvg library
o Attach to existing links instance instead of creating a new instance
o Detect image type based on the first few bytes rather than on
  content-type
o New glyphs taken from Volker's git
o Fixed a bug on Windows where dns lookup got stuck if we closed the
  primary instance (which resulted in fork) while the lookup was in
  progress
o Use OpenMP in the image scaler
o Fixed a bug where the output of font sharpening depended on data read
  from uninitialized memory
o Preallocate downloaded files on Linux
o Support libevent and libev
o Enable SSL SNI, some servers need it
o Test for RAND_* functions in configure because libressl doesn't have
  them
o Support keepalive on https connections