support more character encoding in incoming emails (#15785)
Supporting encodings of iconv on Ruby 1.8 depend on iconv implementation. glibc-common-2.12-1.132 on CentOS6 does not support ks_c_5601-1987.
Contributed by Felix Schäfer.
Authored by: marutosijp 2014-01-01
Parent: [r12473]
Child: [r12475]