configure.ac: Improve C99 compatibility of pthread_create check #423
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Use a fake prototype (similar to the one used by autoconf internally) to avoid calling the undeclared pthread_create function. Otherwie the the check will never succeed with compilers which do not support implicit function declarations. (Implicit function declarations were removed from C99 in 1999.)
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Use a fake prototype (similar to the one used by autoconf internally) to avoid calling the undeclared pthread_create function. Otherwie the the check will never succeed with compilers which do not support implicit function declarations. (Implicit function declarations were removed from C99 in 1999.)
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