alsa-lib: allow building ARM thumb again

alsa-lib: allow building ARM thumb again

The directive mentioned in the comment was removed in:

commit 326c6802e49e5499e16cf141e1cdb0360fce14aa
Author: Riku Voipio <riku.voipio@linaro.org>
Date:   Fri Feb 7 15:38:58 2014 +0200

    alsa-lib: heavy pcm atomics cleanup

    The following patch comes from the realization that at least ARM code
    for atomics is quite broken and nobody has cared for a decade.

    A quick dive shows that only snd_atomic_{read,write}_{begin,end}
    appear to be used widely. These are implemented using wmb/rmb.

    Only other use of atomic functions is in pcm_meter.c.
    The #SND_PCM_TYPE_METER plugin type appears rarely, if ever, used.
    I presume these days anyone who wants a meter/scope will do in pulseaudio
    layer instead of alsa.

    It would seem better fit to have pcm_meter in alsa-plugins instead
    of alsa-lib, but I guess that would be an ABI break...

    So instead, I'm proposing here

    1. Removal of all hand-crafted atomics from iatomic.h apart from barriers,
       which are used in snd_atomic_{read,write}_{begin,end}.

    2. Using __sync_synchronize as the default fallback for barriers. This
       has been available since gcc 4.1, so it shouldn't be a problem.

    3. Defining the few atomics used by pcm_meter.c withing pcm_meter.c
       itself, using gcc atomic builtins[1].

    4. Since gcc atomic builtins are available only since gcc 4.7, add a check for
       that in gcc configure.in, and don't build pcm meter plugin if using
       older gcc.

    The last point has the impact, that if there actually is someone who 1)
    uses the meter plugin 2) wants to upgrade to 2014 alsa-lib 3) but
    does not want to use a 2012+ gcc - that someone will be inconvenienced.

    Finally remove the unneeded configure check for cpu type. We can
    trust the gcc to set right flags for us.

    [1] http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html

    Signed-off-by: Riku Voipio <riku.voipio@linaro.org>
    Signed-off-by: Takashi Iwai <tiwai@suse.de>
(From OE-Core rev: dd442652afef1f83fc6c9651976cd3ba28c83c85)

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>