qt pro 设置编译参数，支持 xp

#兼容 XP VS2015 5.01 版本
win32 {
QMAKE_LFLAGS_WINDOWS = /SUBSYSTEM:WINDOWS,5.01
QMAKE_LFLAGS_CONSOLE = /SUBSYSTEM:CONSOLE,5.01
#DEFINES += _ATL_XP_TARGETING
QMAKE_CFLAGS += /D _USING_V110_SDK71_
QMAKE_CXXFLAGS += /D _USING_V110_SDK71_
#LIBS += -L$$quote(C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Lib)
#INCLUDEPATH += $$quote(C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Include)
}