Autotools: Fix out-of-source builds and epoll_pwait2 check#22334
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- Added main/poll to build directories to enable out-of-source builds.
- AC_CHECK_FUNCS() Autoconf macro doesn't accept 4th argument (it's a link check). Instead, added a AC_CHECK_DECL() fallback check if epoll_pwait2 is defined as a macro (as in glibc at the time of writing in certain scenarios).
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* Added main/poll to build directories to enable out-of-source builds. * AC_CHECK_FUNCS() Autoconf macro doesn't accept 4th argument (it's a link check). Instead, added a AC_CHECK_DECL() fallback check if epoll_pwait2 is defined as a macro (as in glibc at the time of writing in certain scenarios).
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