detect ucontext's swapcontext at build time
Summary: Instead of assuming every posix-y system has ucontext.h, detect swapcontext's existence at build time. Android NDK provides ucontext.h but not its corresponding functions. Reviewed By: yfeldblum Differential Revision: D23695665 fbshipit-source-id: 9e49c6fbf553abff6249d55c780c09cc19d0bb48
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