Remove a bunch of other redundant #includes

Folks have found two in the past week or so; we may as well fix the
others.

Found with:

\#!/usr/bin/python3
import re

def findMulti(fname):
    includes = set()
    with open(fname) as f:
        for line in f:
            m = re.match(r'^\s*#\s*include\s+["<](\S+)[>"]', line)
            if m:
                inc = m.group(1)
                if inc in includes:
                    print("{}: {}".format(fname, inc))
                includes.add(m.group(1))

import sys
for fname in sys.argv[1:]:
    findMulti(fname)