amalgamated build concatenates all files into a single .c file to
allow compiler see all symbols and produce possibly smaller code.
for binary distributions this is what you want, as it's faster but
may consume more memory during compilation.
it however cannot do incremental builds.

fixes killing the server with SIGKILL causing abortiong,
added SIGTERM handler and ignored retcode from uv_run()

this is a workaround, as we don't support `make uninstall` yet