libiconv-full: update to 1.17

libiconv-full: update to 1.17

Release Notes:
- The libiconv library is now licensed under the LGPL version 2.1,
  instead of the LGPL version 2.0. The iconv program continues to
  be licensed under GPL version 3.
- Added converters for many single-byte EBCDIC encodings: IBM-{037,
  273,277,278,280,282,284,285,297,423,424,425,500,838,870,871,875},
  IBM-{880,905,924,1025,1026,1047,1097,1112,1122,1123,1130,1132,1137,
  1140}, IBM-{1141,1142,1143,1144,1145,1146,1147,1148,1149,1153,1154,
  1155,1156,1157}, IBM-{1158,1160,1164,1165,1166,4971,12712,16804}.
  They are available through the configure option
  '--enable-extra-encodings'.

Signed-off-by: Nick Hainke <vincent@systemli.org>