DOC: install: update gcc version requirements

It turns out that gcc-3.4 doesn't build anymore (and it has probably been
the case since 2.4 or so). gcc-4.2 does build fine though, let's mark it
as the oldest supported one. Now that gcc-12 works, also update the most
recently known-to-work version.

(cherry picked from commit ff3333e65846d6653db6973284e92e85a7610765)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 44e9c7285fd533b21c6e1cceffe3d3bad47ea1bf)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
1 file changed