Kernel/LibC: Add ppoll syscall and fix poll

poll is now using its own syscall instead of wrapping aroung pselect.
This adds less overhead on top of poll and adds support for POLLHUP

kernel/include/kernel/Process.h

@@ -16,6 +16,7 @@
 #include <kernel/Terminal/TTY.h>
 #include <kernel/Thread.h>
 
+#include <poll.h>
 #include <sys/banan-os.h>
 #include <sys/mman.h>
 #include <sys/select.h>
@@ -135,6 +136,7 @@ namespace Kernel
 		BAN::ErrorOr<long> sys_ioctl(int fildes, int request, void* arg);
 
 		BAN::ErrorOr<long> sys_pselect(sys_pselect_t* arguments);
+		BAN::ErrorOr<long> sys_ppoll(pollfd* fds, nfds_t nfds, const timespec* tmp_p, const sigset_t* sigmask);
 
 		BAN::ErrorOr<long> sys_epoll_create1(int flags);
 		BAN::ErrorOr<long> sys_epoll_ctl(int epfd, int op, int fd, struct epoll_event* event);