In the table of capture file types, have:

In the table of capture file types, have:

	a field that gives the default extension for the file type,
	*without* a leading "." (i.e., just the extension, not the "."
	that separates it from the rest of the file name), which is NULL
	if there are no known extensions;

	a field that gives a semicolon-separated list of *other*
	extensions, without "*." or ".", which is NULL if there are no
	known extensions or there are no known extensions other than the
	default.

Rename wtap_file_extension_default_string() to
wtap_default_file_extension() (matches the name of the field).

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@40678 f5534014-38df-0310-8fa8-9805f1628bb7