Fixes bug 7727; fix on 0.2.4.10-alpha.

This is allowed by the C statndard, which permits you to represent
doubles any way you like, but in practice we have some code that
assumes that memset() clears doubles in structs.  Noticed as part of
7802 review; see 8081 for more info.

Fix for bug 7308

Fix for bug 7313

Fixes bug 7308; bugfix on no released Tor, since we haven't actually built
right on MSVC in ages.

Patch from yayooo for bug 7260, forward-ported to 0.2.4.

(For real this time.  It turns out that 4 and 5 are different numbers.)

Stewart Smith authored 12 years ago and Nick Mathewson committed 12 years ago

This gives us a few benefits:
1) make -j clean all
   this will start working, as it should. It currently doesn't.
2) increased parallel build
   recursive make will max out at number of files in a directory,
   non-recursive make doesn't have such a limitation
3) Removal of duplicate information in make files,
   less error prone

I've also slightly updated how we call AM_INIT_AUTOMAKE, as the way
that was used was not only deprecated but will be *removed* in the next
major automake release (1.13).... so probably best that we can continue
to bulid tor without requiring old automake.
(see http://www.gnu.org/software/automake/manual/html_node/Public-Macros.html )

For more reasons  why, see resources such as:
http://miller.emu.id.au/pmiller/books/rmch/

Bug 5858; fix on 0.2.3.12-alpha