Just check in a linuxboot.bin binary, since it isn't built on Mac.

N.B. This makes modifying the source for linuxboot.bin somewhat annoying
(since modifying the source will cause qemu to rebuild, but qemu won't
actually use the updated linuxboot.bin).

Change-Id: I752ffde9a05fc6f6fd313a5f2af411e598680f04
diff --git a/pc-bios/linuxboot.bin b/pc-bios/linuxboot.bin
deleted file mode 120000
index 2293e55..0000000
--- a/pc-bios/linuxboot.bin
+++ /dev/null
@@ -1 +0,0 @@
-optionrom/linuxboot.bin
\ No newline at end of file
diff --git a/pc-bios/linuxboot.bin b/pc-bios/linuxboot.bin
new file mode 100644
index 0000000..306002f
--- /dev/null
+++ b/pc-bios/linuxboot.bin
Binary files differ