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/nvramtool/lbtable.c

@@ -31,9 +31,10 @@
 
 #include <stdint.h>
 #include <inttypes.h>
-#include <arpa/inet.h>
 #include <string.h>
+#ifndef __MINGW32__
 #include <sys/mman.h>
+#endif
 #include "common.h"
 #include "coreboot_tables.h"
 #include "ip_checksum.h"