libports: add missing import-libcrypto.mk

Fixes #669
libports: add libssh-0.5.4

Fixes #669
libports: add curl-7.29.0

For now the port is x86_* only because it depends on libcrypto which
is currently not available (as in tested) on arm.

Fixes #669
libports: add iconv-1.14

Fixes #669