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/cli/nvramtool.c

@@ -31,7 +31,9 @@
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
+#ifndef __MINGW32__
 #include <sys/mman.h>
+#endif
 #include "common.h"
 #include "opts.h"
 #include "lbtable.h"
@@ -164,7 +166,9 @@ int main(int argc, char *argv[])
 						nvramtool_op_modifiers[NVRAMTOOL_MOD_USE_CMOS_FILE].param);
 				exit(1);
 			}
+#ifndef __MINGW32__
 			fsync(fd);
+#endif
 		}
 
 		cmos_default = mmap(NULL, 128, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);