virtualbox: Update to new upstream version 4.3.24.

New maintenance release, changes:

 * VMM: emulation fix for the ENTER instruction under certain
   conditions; fixes Solaris 10 guests (VT-x without unrestricted guest
   execution)
 * VMM: fix for handling NMIs on Linux hosts with X2APIC enabled
 * NAT/NAT Network: fix connection drops when the host's DHCP lease was
   renewed (4.3.22 regression; Windows hosts only)
 * NAT: don't crash on an empty domain list when switching the DNS host
   configuration (4.3.22 regression; Mac OS X hosts only)
 * PXE: re-enable it on Windows hosts (4.3.22 regression; Windows hosts
   only)
 * Shared Folders: fixed a problem with Windows guests (4.3.22
   regression)
 * Audio: improved record quality when using the DirectSound audio
   backend
 * VBoxManage: when executing the controlvm command take care that the
   corresponding VM runtime changes are saved permanently
 * Windows Installer: properly install the 32-bit version of VBoxRes.dll
   on 32-bit hosts
 * Linux hosts / guests: Linux 4.0 fixes
 * OS/2 Additions: fixed mouse integration (4.3.22 regression)
 * X11 Additions: fixed a sporadic failure to deactivate virtual screens

Full changelog with bug IDs can be found at:

https://www.virtualbox.org/wiki/Changelog



Signed-off-by: aszlig <aszlig@redmoonstudios.org>