www/icapeg: new port

ICAPeg is an Open Source implementation of ICAP (RFC 3507) server,
designed to enable web proxies to utilize the function of API based
services along with standalone executables and databases in order to
provide content inspection and manipulation services.

WWW: https://github.com/egirna/icapeg

PR: 271151
Reviewed by: diizzy
Signed-off-by: Khaled Emara <kemara@egirna.com>