ntripclient developer agency http://igs.bkg.bund.de/ does not reliably provide a source mirror with version naming.
Created a github repository to provide sources and allow contributions.
Signed-off-by: Nuno Goncalves <nunojpg@gmail.com>
Add missing `sys/select.h` include to `ntripclient.c` to provide
declarations for `struct timeval` and `fd_set` under musl.
Signed-off-by: Jo-Philipp Wich <jow@openwrt.org>