"yyin" is from lex/flex, so it should be "extern", not "static" - we

"yyin" is from lex/flex, so it should be "extern", not "static" - we
have to modify lex/flex's input stream, not some private "FILE *".

Fix up the usage message to:

	mention the "-h" flag;

	not mention the non-existent "-w" flag;

	fit within 80 columns.

Add "-h" to the list of options in the "getopt()" call, as there's code
to support it, and remove "-r" and "-w", as there wasn't any code to
support them.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@5899 f5534014-38df-0310-8fa8-9805f1628bb7