Freeciv

Found while testing #1277, this is an obscure edge case that has likely never happened.

Repro -
civ2civ3 ruleset
edit terrain.ruleset -> ocean_reclaim_requirement = 67
hex tileset
use editing mode to get tech Fusion
put Engineers on a Transport in the ocean on tile with 4 adjacent land tiles
transform to land is available

67% of 6 is 4.02, so should require 5 adjacent land tiles.

  int land_tiles = 100 - count_terrain_class_near_tile(nmap, ptile,
                                                       FALSE, TRUE,
                                                       TC_OCEAN);

count_terrain_class_near_tile() returns 33%, which should really be 33.3%,
100 - that = 67, should really be 66.7,
and 66.7 >= 67 should fail but 67 >= 67 succeeds.

Obvious fix is

  int land_tiles = count_terrain_class_near_tile(nmap, ptile,
                                                 FALSE, TRUE, TC_LAND);

But there must have been some reason it was coded like it is,
instead of the obvious way - wish there were a comment.
The way it is has side effect that Inaccessible and "off-the-map" tiles
are counted as land tiles.