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On platform that do not provide __atomic_exchange_1(), and when
libatomic is not available (e.g., threads support disabled) link of
libcurl.so fails. To solve this use an indirect way to make HAVE_ATOMIC
undefined. Add an upstream patch for checking the stdatomic.h header,
and seed the 'no' answer.
Fixes:
http://autobuild.buildroot.net/results/8f695d4dbb91cfde8e93ab38e837b0a0042b986b/
http://autobuild.buildroot.net/results/3b4712b0ace52da1650e88cdaafb6a20be135464/
Cc: Matt Weber <matthew.weber@collins.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit f81454db59)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>