just as a scroll of Enchant Weapon III does.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4710 c06c8d41-db1a-0410-9941-cceddc491573
R2REVABQAP5DESJVIC4UVL2WW6KRIV4INH5ABBDZYHCGAL54INFAC
6VIU5UKD5ZWLEF2MEB42NJ3BYQYAJXSGAJXRO2Q4POX4HNRPYGUAC
VEPHAIXR3GSPHBLOW5DWFFU4ULEMVWRQG4G5PKSKRA2I6RHYROUAC
K2CS6TCX2NDVL2ASEHGP4J4K4IJ6FP3ANNKTSIWVG43HPYSBX6ZQC
if (coinflip()) enchant_weapon( ENCHANT_TO_HIT, true, you.inv[wpn] );
if (coinflip())
enchant_weapon( ENCHANT_TO_HIT, true, you.inv[wpn] );
if (coinflip()) enchant_weapon( ENCHANT_TO_DAM, true, you.inv[wpn] );
enchant_weapon( ENCHANT_TO_DAM, true, you.inv[wpn] );