[Xenomai] xenomai-3.git next branch build failure

[Jeff Webb <jeff.webb@nta-inc.net>]

When trying to compile the 'next' branch of xenomai-3.git under Ubuntu 14.04, I get this error:

Making all in autotune
make[2]: Entering directory `/home/webb-ja/deb/xenomai-3.git.test/utils/autotune'
gcc -DHAVE_CONFIG_H -I. -I../../include  -I/home/webb-ja/deb/xenomai-3.git.test/lib/cobalt/arch/x86/include -I/home/webb-ja/deb/xenomai-3.git.test/kernel/cobalt/arch/x86/include -DNDEBUG -O2 -D_GNU_SOURCE -D_REENTRANT -pipe -fstrict-aliasing -Wall -Wstrict-prototypes -Wmissing-prototypes -Wno-long-long -Wno-unused-parameter -Werror -D__XENO__ -D__IN_XENO__ -I/home/webb-ja/deb/xenomai-3.git.test/include/cobalt -I../../include    -MT autotune-autotune.o -MD -MP -MF .deps/autotune-autotune.Tpo -c -o autotune-autotune.o `test -f 'autotune.c' || echo './'`autotune.c
autotune.c: In function ‘main’:
autotune.c:298:9: error: ignoring return value of ‘daemon’, declared with attribute warn_unused_result [-Werror=unused-result]
    daemon(0, 0);
          ^
cc1: all warnings being treated as errors
make[2]: *** [autotune-autotune.o] Error 1
make[2]: Leaving directory `/home/webb-ja/deb/xenomai-3.git.test/utils/autotune'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/webb-ja/deb/xenomai-3.git.test/utils'
make: *** [all-recursive] Error 1

I see this sort of thing often due to Ubuntu's default compiler flags settings.  I applied the attached patch to fix it.

-Jeff
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