gcc -Wall lint:

	gcc -Wall lint:
	* thread.c: Include "gdbcmd.h" and <ctype.h>.
	* Makefile.in: Update dependency.
	* thread.c (thread_command): Remove unused variable p.
	* values.c (unpack_double): Use len instead of TYPE_LENGTH (type).
	* valprint.c (print_floating): Correctly check sign bit now that
	we are using unsigned arithmetic.
	* symtab.c (find_pc_line_range): Remove unused variables exact_match,
	ind, and l.