Fix Rectangle.Offset being defined wrong in the XNA proxies.
Fix Rectangle.Offset being defined wrong in the XNA proxies.

sq/JSIL,dmirmilshteyn/JSIL,antiufo/JSIL,acourtney2015/JSIL,dmirmilshteyn/JSIL,volkd/JSIL,volkd/JSIL,acourtney2015/JSIL,iskiselev/JSIL,Trattpingvin/JSIL,sq/JSIL,TukekeSoft/JSIL,hach-que/JSIL,x335/JSIL,TukekeSoft/JSIL,sander-git/JSIL,sq/JSIL,acourtney2015/JSIL,volkd/JSIL,acourtney2015/JSIL,sq/JSIL,x335/JSIL,iskiselev/JSIL,mispy/JSIL,FUSEEProjectTeam/JSIL,iskiselev/JSIL,FUSEEProjectTeam/JSIL,mispy/JSIL,dmirmilshteyn/JSIL,mispy/JSIL,hach-que/JSIL,hach-que/JSIL,antiufo/JSIL,sander-git/JSIL,acourtney2015/JSIL,dmirmilshteyn/JSIL,Trattpingvin/JSIL,antiufo/JSIL,sq/JSIL,hach-que/JSIL,volkd/JSIL,hach-que/JSIL,sander-git/JSIL,FUSEEProjectTeam/JSIL,sander-git/JSIL,Trattpingvin/JSIL,Trattpingvin/JSIL,mispy/JSIL,iskiselev/JSIL,x335/JSIL,TukekeSoft/JSIL,iskiselev/JSIL,TukekeSoft/JSIL,FUSEEProjectTeam/JSIL,antiufo/JSIL,x335/JSIL,FUSEEProjectTeam/JSIL,sander-git/JSIL,volkd/JSIL