Liburing 2.6

liburing-2.6 release

• Add getsockopt and setsockopt socket commands
• Add test cases to test/hardlink
• Man page fixes
• Add futex support, and test cases
• Add waitid support, and test cases
• Add read multishot, and test cases
• Add support for IORING_SETUP_NO_SQARRAY
• Use IORING_SETUP_NO_SQARRAY as the default
• Add support for IORING_OP_FIXED_FD_INSTALL
• Add io_uring_prep_fixed_fd_install() helper
• Support for napi busy polling
• Improve/add test cases
• Man page fixes
• Add sample 'proxy' example