LibC: Move ioctl to <sys/ioctl.h>

Some ports seem to be assuming that ioctl exists there and not in
stropts.h

userspace/libraries/LibC/sys/ioctl.cpp

@@ -0,0 +1,14 @@
+#include <stdarg.h>
+#include <sys/ioctl.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int ioctl(int fildes, int request, ...)
+{
+	va_list args;
+	va_start(args, request);
+	void* extra = va_arg(args, void*);
+	va_end(args);
+
+	return syscall(SYS_IOCTL, fildes, request, extra);
+}