add seabios as submodule

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "seabios"]
+	path = seabios
+	url = https://github.com/coreboot/seabios.git

patches/001_seabios_menuconfig.patch

@@ -0,0 +1,13 @@
+Index: boot/seabios/scripts/kconfig/lxdialog/check-lxdialog.sh
+===================================================================
+--- boot.orig/seabios/scripts/kconfig/lxdialog/check-lxdialog.sh
++++ boot/seabios/scripts/kconfig/lxdialog/check-lxdialog.sh
+@@ -43,7 +43,7 @@ trap "rm -f $tmp" 0 1 2 3 15
+ check() {
+         $cc -x c - -o $tmp 2>/dev/null <<'EOF'
+ #include CURSES_LOC
+-main() {}
++int main() { return 0; }
+ EOF
+ 	if [ $? != 0 ]; then
+ 	    echo " *** Unable to find the ncurses libraries or the"       1>&2

patches/series

@@ -0,0 +1 @@
+001_seabios_menuconfig.patch

seabios

@@ -0,0 +1 @@
+Subproject commit e5f2e4c69643bc3cd385306a9e5d29e11578148c