This appeases some versions of MSVC, which don't like it when you
have preprocessor commands inside a set of macro arguments.

Back when we changed the idea of a connection being "too old" for new
circuits into the connection being "bad" for new circuits, we didn't
actually change the info messages.  This led to telling the user that
we were labelling connections as "too old" for being worse than
connections that were actually older than them.

Found by Scott on or-talk.

Build on Ubuntu 10.04 64-bit was failing:

util.c: In function ‘parse_http_time’:
util.c:1370: error: not protecting function: no buffer at least 8 bytes long

We don't want to lose -Werror, and we don't care too much about the
added overhead of protecting even small buffers, so let's simply turn on
SSP for all buffers.

Thanks to Jacob Appelbaum for the pointer and SwissTorExit for the
original report.

Signed-off-by: Andy Isaacson <adi@hexapodia.org>

This patch adds support for two new configure options:
    '--enable-gcc-hardening'
    This sets CFLAGS to include:
        "-D_FORTIFY_SOURCE=2 -fstack-protector-all"
        "-fwrapv -fPIE -Wstack-protector -Wformat -Wformat-security"
        "-Wpointer-sign"
    It sets LDFLAGS to include:
        "-pie"

    '--enable-linker-hardening'
    This sets LDFLAGS to include:
        " -z relro -z now"

The main changes are to explain how we use git branches, how we use
changes files, and what should go into a patch.  Putting these in
HACKING means that we shouldn't need to constantly refer to the or-dev
emails where we explain this stuff.