Fixed stupid bug : it was not possible to rotate a brush 180° from the brush transform menu if hte height was even !!?

Also use proper NAN value if it exists when rotating a brush (we use some floats there and it's better to do it this way)


git-svn-id: svn://pulkomandy.tk/GrafX2/trunk@1170 416bcca6-2ee7-4201-b75f-2eb2f807beb1

buttons.c

@@ -3728,7 +3728,6 @@ void Button_Brush_FX(void)
       Rotate_90_deg();
       break;
     case  5 : // 180° Rotation
-      if (Brush_height&1)
       Rotate_180_deg_lowlevel(Brush, Brush_width, Brush_height);
       Brush_offset_X=(Brush_width>>1);
       Brush_offset_Y=(Brush_height>>1);