gains or loses the slow or haste enchantments.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@2452 c06c8d41-db1a-0410-9941-cceddc491573
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{ int old_speed = speed;
{
int old_speed = speed;
ench_countdown = div_rand_round(ench_countdown * speed, old_speed);
}