OvmfPkg: VirtioBlkDxe: fix div & mod of 64-bit dividends on IA32/gcc-4.4

OvmfPkg: VirtioBlkDxe: fix div & mod of 64-bit dividends on IA32/gcc-4.4

OvmfPkg/VirtioBlkDxe/VirtioBlk.c:667: undefined reference to `__umoddi3'
OvmfPkg/VirtioBlkDxe/VirtioBlk.c:750: undefined reference to `__udivdi3'

These operations would come from libgcc in the IA32 build, but OVMF does not
link against libgcc.

Regression-tested the X64 build with Fedora 18 Alpha XFCE and Windows 8
Consumer Preview guests.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@13846 6f19259b-4bc3-4df7-8a09-765794883524