perly.c: Disarm the YYDEBUG defines in perly.h

See <craigberry-E9C729.16313730092012@cpc2-bmly6-0-0-cust974.2-3.cable.virginmedia.com>.

Move the YYDEBUG defines in perly.c back where they were before, but
undefine YYDEBUG first.  That leaves bison 2.6’s YYDEBUG defines in
perly.h harmless.

Author: Father Chrysostomos

perly.c

@@ -27,13 +27,6 @@
 
 #include "EXTERN.h"
 #define PERL_IN_PERLY_C
-
-#ifdef DEBUGGING
-#  define YYDEBUG 1
-#else
-#  define YYDEBUG 0
-#endif
-
 #include "perl.h"
 
 typedef unsigned char yytype_uint8;
@@ -45,6 +38,15 @@ typedef signed char yysigned_char;
 /* YYINITDEPTH -- initial size of the parser's stacks.  */
 #define YYINITDEPTH 200
 
+#ifdef YYDEBUG
+#  undef YYDEBUG
+#endif
+#ifdef DEBUGGING
+#  define YYDEBUG 1
+#else
+#  define YYDEBUG 0
+#endif
+
 #ifndef YY_NULL
 # define YY_NULL 0
 #endif