ngaro and brndnmtthws Fix problems found when fixing docker (#575)
* Require at least glib-2.36 (from 03/2013) to remove deprecated g_type_init()

* Fix empty continuation line in Dockerfile

* Require at least libmicrohttpd 0.9.25 (from 09/2012) to replace deprecated MHD_create_response_from_data()

* fix versioncheck libmicrohttpd

* Missing char for null-terminator in print_v6addrs()

* safe_asprintf to fix /proc/subdir bufferoverflows

There is no max length of /proc/subdir, increasing the value of /proc/sys/kernel/pid_max is one way this can happen

* Fix conversion constant c++ string to variable char array

* Fix strncpy using unrelated MPD_BUFFER_MAX_LENGTH

* Use strncpy instead of strcpy in

* Use strncpy instead of strcpy in

* move safe_asprintf back and use ostreams in to make sonarcloud happy
Latest commit 4d5db32 Aug 7, 2018