[SeaBIOS] [RFC] SeaBIOS v1.7.2.1 stable release

[Kevin O'Connor]

There's been requests for a stable release.  Here's a list of patches
that have been requested / that I think would be useful:

616fb27f - Update tools/acpi_extract.py to handle iasl 20130117 release.
7cac600a - USB-EHCI: Fix null pointer assignment
4c405cbf - Fix Makefile - don't reference "out/" directly, instead use "$(OUT)".
23219122 - build: Don't require $(OUT) to be a sub-directory of the main directory.
bb0808a2 - Verify CC is valid during build tests.
555a2136 - seabios q35: Enable all PIRQn IRQs at startup
b9490408 - seabios q35: Add new PCI slot to irq routing function
dbb7a66f - seabios: Add a dummy PCI slot to irq mapping function

Comments?

-Kevin