Squelch a number of "-Wall" errors by:

	1) renaming "snprintf.h" to "snprintf-imp.h" (it contains stuff
	   used by the "snprintf()" *implementation*, but not stuff it
	   *exports*);

	2) creating a new "snprintf.h" to declare "vsnprintf()" and
	   "snprintf()";

	3) removing an unused variable;

	4) fixing a call to "add_item_to_tree()" to handle the
	   possibility of "ntohl()" returning a "long" rather than an
	   "int".


git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@47 f5534014-38df-0310-8fa8-9805f1628bb7

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