Revert "Code Cleanup: Suppress Xcode warnings"

This reverts commit 6a97d81e4f.
It causes a SEGV.

src/DataFilter.l

@@ -69,5 +69,3 @@ void DataFilter_clearString()
     DataFilterlex_destroy();
 }
 
-static int _suppress = yyinput();
-

src/JsonRideFile.l

@@ -71,5 +71,3 @@
 [ \n\t\r]           ;               /* we just ignore whitespace */
 .                   return JsonRideFiletext[0]; /* any other character, typically :, { or } */
 %%
-
-static int _suppress = yyinput();

src/WithingsParser.l

@@ -74,5 +74,3 @@ void WithingsParser_reset()
 {
     WithingsParser_delete_buffer (my_state);
 }
-
-static int _suppress = yyinput();