build: build coreboot on mingw.

regex, pdcurses, wsock(for itohl) are seperated libraries. mmap and unmmap are
ported from git.

Issues:
1. The length of command line is limited. That makes the Thather can not be built
  because too many obj.o need to be built.

Change-Id: I1d60ec5c7720c1e712e246c4cd12e4b718fed05f
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: Zheng Bao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/1604
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

util/kconfig/lxdialog/check-lxdialog.sh

@@ -5,7 +5,7 @@
 ldflags()
 {
 	for ext in so a dylib ; do
-		for lib in ncursesw ncurses curses ; do
+		for lib in ncursesw ncurses curses pdcursesw pdcurses; do
 			$cc -print-file-name=lib${lib}.${ext} | grep / >/dev/null
 			if [ $? -eq 0 ]; then
 				echo "-l${lib}"