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/common.h

@@ -58,6 +58,21 @@
 #define LINE_EOF (COMMON_RESULT_START + 0)
 #define LINE_TOO_LONG (COMMON_RESULT_START + 1)
 
+#ifdef __MINGW32__
+#define PROT_READ 1
+#define PROT_WRITE 2
+#define MAP_PRIVATE 1
+
+void *win32_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
+int win32_munmap(void *start, size_t length);
+
+#define mmap win32_mmap
+#define munmap win32_munmap
+
+#define MAP_FAILED ((void *)-1)
+#define MAP_SHARED 1
+#endif
+
 /* basename of this program, as reported by argv[0] */
 extern const char prog_name[];