Update qemu to 1.3.1. (updating during freeze is ok'ed by wiz@)

Note the previous qemu-1.3.0 has some problems to run
NetBSD/i386 6.0.1 guest on NetBSD/i386 6.0.1 host, but
with qemu-1.3.1 NetBSD/i386 guest works enough upto multiuser.

No explicit ChangeLog of qemu-1.3.1 release,
but there is a summary in qemu mailing list announcement:
http://lists.nongnu.org/archive/html/qemu-stable/2013-01/msg00126.html

04024de: update VERSION for v1.3.1 (Michael Roth)
1bd4397: qxl: Fix SPICE_RING_PROD_ITEM(), SPICE_RING_CONS_ITEM() sanity check
         (Markus Armbruster)
e766724: Fix compile errors when enabling Xen debug logging. (Sander
         Eikelenboom)
df50a7e: xen: fix trivial PCI passthrough MSI-X bug (Stefano Stabellini)
90c96d3: xen_disk: fix memory leak (Roger Pau Monne)
4ee2879: tcg/target-arm: Add missing parens to assertions (Peter Maydell)
563068a: win32-aio: Fix memory leak (Kevin Wolf)
cdb4834: win32-aio: Fix vectored reads (Kevin Wolf)
9d173df: aio: Fix return value of aio_poll() (Kevin Wolf)
204dd38: raw-posix: fix bdrv_aio_ioctl (Paolo Bonzini)
86bab45: vfio-pci: Loosen sanity checks to allow future features (Alex
         Williamson)
006c747: pci-assign: Enable MSIX on device to match guest (Alex Williamson)
f042cca: vfio-pci: Make host MSI-X enable track guest (Alex Williamson)
1205b80: target-xtensa: fix search_pc for the last TB opcode (Max Filippov)
ff0c079: buffered_file: do not send more than s->bytes_xfer bytes per tick
         (Paolo Bonzini)
d745511: migration: fix migration_bitmap leak (Paolo Bonzini)
5afd0ec: e1000: Discard oversized packets based on SBP|LPE (Michael Contreras)
c4cd5b0: qxl+vnc: register a vm state change handler for dummy spice_server
         (Uri Lublin)
7ca2496: qxl: save qemu_create_displaysurface_from result (Gerd Hoffmann)
bfae937: target-xtensa: fix ITLB/DTLB page protection flags (Max Filippov)
b68c48f: pixman: fix vnc tight png/jpeg support (Gerd Hoffmann)
36fd817: Update seabios to a810e4e72a0d42c7bc04eda57382f8e019add901 (Gerd
         Hoffmann)
0bc5f4a: seabios: update to e8a76b0f225bba5ba9d63ab227e0a37b3beb1059 (Gerd
         Hoffmann)
37e1428: vfio-pci: Don't use kvm_irqchip_in_kernel (Alex Williamson)
518799a: target-mips: Fix incorrect shift for SHILO and SHILOV (Petar Jovanovic)
16c5fe4: target-mips: Fix incorrect code and test for INSV (Petar Jovanovic)
f1a2195: migration: Fix madvise breakage if host and guest have different page
         sizes (David Gibson)
3b4fc1f: Fix off-by-1 error in RAM migration code (David Gibson)
d67d95f: Disable semaphores fallback code for OpenBSD (Brad Smith)
0a7ad69: Fix semaphores fallback code (Brad Smith)
Updated emulators/qemu to 1.3.1