Add ioctl() and reimplement tcsetpgrp/tcsetpgrp as ioctls.

VirtualFileSystem/CharacterDevice.cpp

@@ -1,4 +1,5 @@
 #include "CharacterDevice.h"
+#include <LibC/errno_numbers.h>
 
 CharacterDevice::~CharacterDevice()
 {
@@ -8,3 +9,8 @@ RetainPtr<FileDescriptor> CharacterDevice::open(int options)
 {
     return VFS::the().open(*this, options);
 }
+
+int CharacterDevice::ioctl(Process&, unsigned, unsigned)
+{
+    return -ENOTTY;
+}