makehtml: proper fix for t4ht

So recent Fedora and some other distros have broken t4ht
packages, making makehtml fail.  The correct fix is to put a
working t4ht somewhere in your path.

For example, for Fedora one can get an old copy from here:
http://pkgs.fedoraproject.org/repo/pkgs/tetex-tex4ht/tex4ht-1.0.2008_02_28_2058.tar.gz/dc9d78c8ad22acd4b40dfd2cbbe2b8de/tex4ht-1.0.2008_02_28_2058.tar.gz
after unpacking, t4ht is under ./bin/linux/t4ht, put it on path.
tex4ht.env is under texmf/tex4ht/base/unix/tex4ht.env, put it
in $HOME (you can rename it .tex4ht) or under current directory.

Revert the work-around in makehtml, but keep it around
in a comment for people who want to use it.
alternatively, someone might want to implement auto-detection
of the broken t4ht and apply the work-around automatically.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@125 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652

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