r38: configure.in:

r38: configure.in:
	* Added extra checks as suggested by autoscan
	* Added --enable-lfs option, to avoid having to play with CFLAGS
config.h.in:
	* Updated
nbd-server.c:
	* Rectify type of mainloop::size_host, closing sf.net bugs #
	  814435 and 817385
	* Added socket option SO_KEEPALIVE, so that keepalive packages
	  are being sent after "a while" (still two hours with the
	  Linux kernel's default settings, but oh well). Closes sf.net
	  bug # 819235.
	* fclose() the PID file after writing to it, so that other
	  processes can actually read our PID from that file. Makes it
	  a bit useful, too.
cliserv.h:
	* Support for --enable-lfs option.