modify AGG/FreeImage make-file output folder.

FreeImage modification :
 1) FreeImage\Dist\FreeImage.h   #include "FI_MemIO.h"
 2) FreeImage\Dist\FreeImage_Flib.h   delete BOOL/RGBQUAD/RGBTRIPLE/BITMAPINFOHEAFER

Change the following in agg_gray8.h
 
        //--------------------------------------------------------------------
        gray8(const rgba& c) :
            v(int8u((0.299*c.r + 0.587*c.g + 0.114*c.b) * 255.0 + 0.5)),
            a(int8u(c.a*255.0)) {}