Used for merge

*Delete the script codes.
*Modify the copy right
*Add --enable-winrtapi to configure
*Modify the doc/platform.texi
*change restrict to av_restrict, this should be a bug in compiling.
Yes it necessary. These api can be used and linked into the static library, so the check_func_headers cannot die it. If a developer want to use these library with these api, who will failed with WACK test.