(drop conf.define('HAVE_CELT', ...) since the AutoOption class handles this)

No functional change, only whitespace.

This reverts commit 3087895772.

Some python implementations report "linux3" on newer kernels. Of course,
we'll have to set IS_LINUX for those, too.

As reported by Peter Nelson, waf's check_cfg sets HAVE_OPUS=1 if the
pkg-config check is successful, however, the code requires OPUS custom
headers.

So if a dev package without custom headers is installed, explicitly
reset HAVE_OPUS to 0 to fix the FTBFS.

Signed-off-by: Eliot Blennerhassett <Eliot@Blennerhassett.gen.nz>

CCFLAGS isn't honoured at all, the proper name is CFLAGS.

conf.write_config_header() defaults to remove=True, so conf.defines() is
empty afterwards. Consequently, config.h is empty, too.

Set remove to False, so calling it another time for 32_64 builds works.

Closes: #21

Patch by Adam Conrad <adconrad@canonical.com>, taken from Ubuntu's
jackd2 package.

Fixes linkage errors as described in

   http://permalink.gmane.org/gmane.comp.audio.jackit/25841

Tested by Debian on hurd-i386, kfreebsd-amd64 and kfreebsd-i386.

In new waf, defines are no longer added to the conf environment, they
only end up in config.h. Consequently, they can't be referenced later
from the wscript.

So explicitly put ADDON_DIR to conf.env.

Instead of rewriting all end=' ' statements, we can import the new print
function in python-2.6.0a2 or newer. Should be "old enough".

conf.env no longer contains conf.defines, they are now in
conf.env.DEFINES and are only a list.

Resort to the options parser and directly use this value.

The method name has changed in recent versions of waf.

Prevents waf configure from failing if not marked as non-mandatory.

Util no longer provides the pprint method, let's use Logs.pprint
instead.

Utils.detect_platform is no longer available, so let's use the
underlying sys.platform instead. On Linux, sys.platform returns "linux2"
these days, but upstreams is considering to change it "linux" in the
future.

Automatically upgrading to python3 syntax, where possible.