Add a way to initialize VFS globals.

This is needed since the kernel loader doesn't even zero out bss,
much less call any static constructors.

VirtualFileSystem/VirtualFileSystem.cpp

@@ -7,6 +7,11 @@
 
 //#define VFS_DEBUG
 
+void VirtualFileSystem::initializeGlobals()
+{
+    FileSystem::initializeGlobals();
+}
+
 static dword encodedDevice(unsigned major, unsigned minor)
 {
     return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);