Persuade tsearch/tsearch2 to work (or at least pass their regression

tests) when using flex 2.5.31.  The fix is to *not* try to use palloc
and pfree for allocations within the lexer; when you do that, the
yy_buffer_stack gets freed at inopportune times.  The code is already
set up to do manual deallocation, so I see no particular advantage to
using palloc anyway.

contrib/tsearch/parser.l

@@ -7,16 +7,6 @@
 /* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
 #define fprintf(file, fmt, msg)  ereport(ERROR, (errmsg_internal("%s", msg)))
 
-/* postgres allocation function */
-#define free    pfree
-#define malloc  palloc
-#define realloc repalloc
-
-#ifdef strdup
-#undef strdup
-#endif
-#define strdup  pstrdup
-
 char *token = NULL;  /* pointer to token */
 char *s     = NULL;  /* to return WHOLE hyphenated-word */
 

contrib/tsearch2/wordparser/parser.l

@@ -8,16 +8,6 @@
 /* Avoid exit() on fatal scanner errors */
 #define fprintf(file, fmt, msg)  ts_error(ERROR, fmt, msg)
 
-/* postgres allocation function */
-#define free    pfree
-#define malloc  palloc
-#define realloc repalloc
-
-#ifdef strdup
-#undef strdup
-#endif
-#define strdup  pstrdup
-
 char *token = NULL;  /* pointer to token */
 char *s     = NULL;  /* to return WHOLE hyphenated-word */
 
@@ -303,6 +293,3 @@ void start_parse_str(char* str, int limit) {
 	tsearch2_yy_switch_to_buffer( buf );
 	BEGIN INITIAL;
 }
-
-
-