images.cocoa, images.gdiplus: remove hacks around old limited-stream throwing behavior

basis/images/cocoa/cocoa.factor

@@ -1,8 +1,7 @@
 ! (c)2010 Joe Groff bsd license
 USING: accessors alien.data cocoa cocoa.classes cocoa.messages
 combinators core-foundation.data core-graphics.types fry images
-images.loader io io.streams.limited kernel literals math 
-sequences ;
+images.loader io kernel literals math sequences ;
 IN: images.cocoa
 
 SINGLETON: ns-image
@@ -64,5 +63,4 @@ PRIVATE>
 
 M: ns-image stream>image
     drop
-    dup limited-stream? [ stream-eofs >>mode ] when
     [ load-image-rep ] with-input-stream image-rep>image ;

basis/images/gdiplus/gdiplus.factor

@@ -55,8 +55,7 @@ SINGLETON: gdi+-image
 PRIVATE>
 
 M: gdi+-image stream>image
-    drop
-    dup limited-stream? [ stream-eofs >>mode ] when [
+    drop [
         start-gdi+ &stop-gdi+ drop
         stream>gdi+-bitmap
         gdi+-bitmap>data