[Freeciv-Dev] (PR#6282) tech bug

["Per I. Mathisen" <per@xxxxxxxxxxx>]

Assert: civserver: plrhand.c:274: found_new_tech: Forutsetningen
(assertion)  «(tech_exists(tech_found) && get_invention(plr, tech_found)
!= TECH_KNOWN) || tech_found == (200-2)» feile.

To reproduce: Login as 'per', press turn done.

Backtrace:
#2  0x42020f95 in __assert_fail () from /lib/tls/libc.so.6
#3  0x0807d329 in found_new_tech (plr=0x81f1848, tech_found=23,
    was_discovery=true, saving_bulbs=false) at plrhand.c:290
#4  0x0807d425 in tech_researched (plr=0x81f1848) at plrhand.c:464
#5  0x0807d4bb in update_tech (plr=0x81f1848, bulbs=0) at plrhand.c:480
#6  0x08068598 in update_city_activity (pplayer=0x81f1848,
pcity=0x83eb4c0)
    at cityturn.c:1344
#7  0x080667cd in update_city_activities (pplayer=0x81f1848) at
cityturn.c:352
#8  0x0804dc33 in end_turn () at srv_main.c:504
#9  0x0804f170 in main_loop () at srv_main.c:1506
#10 0x0804f4d6 in srv_main () at srv_main.c:1590
#11 0x08049faa in main (argc=3, argv=0xbffff874) at civserver.c:154

  - Per

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