recvfrom returns ssize_t, not size_t
Fix clang build under mavericks (OSX 10.9)
Ignore sw_vers subversion when selecting SDK
Ignore dSYM extension
Fix typo in version.c
Re-arrange paths for -I and -L.

So that paths passed on the command line, or in ENV are preferred
to ones which we auto-add

Manual port of 74b688b39b
Work around autoconf and shell issues.

Which expect paths to NOT have spaces in them.  Which they do
on OSX.
Port OpenSSL build fixes from master.

All of the OpenSSL checks in configure.in have been replaced
with the code from master.

The sub-Makefiles which reference OPENSSL_* have had those
references deleted.  The CFLAGS and LIBS now have the requisite
definitions.

Set LTCFLAGS=" " to work around stupid libtool issues.
No, the libtool authors aren't smarter than me.  Their "magic"
actively breaks things I want to do.  Which are valid.  And which
work in a NORMAL CC/LD environment, without their idiocy.

I'm happy 3.x and "master" don't have libtoo.  It's a blight upon
the face of the earth.
Note changes for Mavericks