linux-user: enable tb unlinking when compiled with NPTL
Fixes receiving signals when guest code is being executed in a tight loop. For an example, try interrupting the following code with ctrl-c. http://nchipin.kos.to/test-loop.c The tight loop is ofcourse brainless, but it is also exactly how the waitpid* testcases are implemented. Signed-off-by: NRiku Voipio <riku.voipio@nokia.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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