We no longer need a prototype for __eprintf

It looks like it was only needed on OSX, but it has a prototype in
assert.h which now gets #included.

rts/Linker.c

@@ -977,8 +977,7 @@ typedef struct _RtsSymbolVal {
       SymI_NeedsProto(__muldi3)			       \
       SymI_NeedsProto(__ashldi3)		       \
       SymI_NeedsProto(__ashrdi3)		       \
-      SymI_NeedsProto(__lshrdi3)		       \
-      SymI_NeedsProto(__eprintf)
+      SymI_NeedsProto(__lshrdi3)
 #else
 #define RTS_LIBGCC_SYMBOLS
 #endif