Some minor adjustments.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Fix
CVE-2017-1000472 - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-1000472

Signed-off-by: Jan Pavlinec <jan.pavlinec@nic.cz>

POrtable COmponents is a Modern, powerful open source C++ class libraries
for building network- and internet-based applications that run on desktop,
 server, mobile and embedded systems.

Original Makefile -->
https://dev.openwrt.org/browser/packages/libs/poco/Makefile

add license
add maintainer
update URL to latest github stable version (1.7.0)
change patch to the configure file
add a patch to build with musl-libc

Signed-off-by: Jean-Michel Julien <jean-michel.julien@trilliantinc.com>