* symtab.c, symfile.c, c-exp.y, ch-exp.y, m2-exp.y, buildsym.c,

	* symtab.c, symfile.c, c-exp.y, ch-exp.y, m2-exp.y, buildsym.c,
	symfile.h, stabsread.c, minsyms.c, solib.c, nlmread.c, dwarfread.c
	partial-stab.h, symmisc.c, gdbtypes.c: Lint.  Remove (or put
	inside #if) unused variables and labels.  Fix unclosed comment.
	Deal with enumeration values unhandled in switch statements.  Make
	sure non-void functions return values.  Include appropriate
	headers.
	* dbxread.c (elfstab_build_psymtabs): Don't check for unsigned
	value < 0.