compiles on sparc again

lib/system/gc.nim

@@ -802,7 +802,7 @@ when defined(sparc): # For SPARC architecture.
     # Addresses decrease as the stack grows.
     while sp <= max:
       gcMark(gch, sp[])
-      sp = cast[ppointer](cast[TAddress](sp) +% sizeof(pointer))
+      sp = cast[PPointer](cast[TAddress](sp) +% sizeof(pointer))
 
 elif defined(ELATE):
   {.error: "stack marking code is to be written for this architecture".}

todo.txt

@@ -4,7 +4,6 @@ version 0.9.4
 - fix GC issues
 - fix macros\tstringinterp.nim
 - test and fix showoff
-- test C source code generation
 - fix closures
 - test and fix exception handling
 - implement 'union' and 'bits' pragmas