fix iconv
Success: x11-toolkits/hs-OpenGL v2.8.0.0_2,1
Success: math/hs-erf v2.0.0.0_8
Success: net/hs-socks v0.5.1_2
Success: devel/hs-asn1-types v0.1.3_2
Success: devel/hs-data-pprint v0.2.1.4_4
Success: security/hs-crypto-pubkey-types v0.3.2_2