Qt5 for windows plugin dll

Qt5 为windows开发release程序时，所需要的dll最小集合

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     文件      120334  2015-12-29 06:25  Release\libgcc_s_dw2-1.dll
     文件     1540622  2015-12-29 06:25  Release\libstdc++-6.dll
     文件       79360  2015-12-29 06:25  Release\libwinpthread-1.dll
     目录           0  2017-11-11 02:36  Release\platforms\
     文件       22016  2017-01-19 04:44  Release\platforms\libEGL.dll
     文件     2801664  2017-01-19 04:43  Release\platforms\libGLESv2.dll
     文件     1077760  2017-01-19 02:04  Release\platforms\qwindows.dll
     文件     4701696  2017-10-18 16:20  Release\Qt5Core.dll
     文件     4918784  2017-01-19 01:55  Release\Qt5Gui.dll
     文件     4490752  2017-01-19 01:59  Release\Qt5Widgets.dll