fix compile for mingw32

git-svn-id: http://btstack.googlecode.com/svn/trunk@2979 1a0a8af8-31b5-11de-8e0c-53a27eea117e
fix compile for win32

git-svn-id: http://btstack.googlecode.com/svn/trunk@2980 1a0a8af8-31b5-11de-8e0c-53a27eea117e
link against lws2_32 on mingw32

git-svn-id: http://btstack.googlecode.com/svn/trunk@2981 1a0a8af8-31b5-11de-8e0c-53a27eea117e
release packet buffer after last acl fragment for synchronous HCI transport implementation

git-svn-id: http://btstack.googlecode.com/svn/trunk@2982 1a0a8af8-31b5-11de-8e0c-53a27eea117e