Changes in 2.4.2*** common changes ***
* Added support of build using musl instead of glibc.
* Add support of build in Cygwin environment.
* Added configuration option LUA_VERSION (unset by default) for choosing specific version of Lua library in the systems if necessary.
*** libeiskaltdcpp ***
* Fix search on ADC hubs. (It was accidentally broken in 2.4.1 release.)
File information: EiskaltDC++ 2.4.2 leave one here.