Core: Increase AST_PBX_MAX_STACK to 512 if not LOW_MEMORY

The current settings AST_PBX_MAX_STACK is 128 entries which is
too low for some FreePBX installations with complex parking
arrangements.  Increased to 512 if LOW_MEMORY is not defined.

ASTERISK-28300

Change-Id: I7c4b540bc92e6642df0f3da639b003f7da8b1299

include/asterisk/extconf.h

@@ -220,7 +220,11 @@ enum ext_match_t {
 	E_SPAWN =	0x12,	/* want to spawn an extension. Requires exact match */
 	E_FINDLABEL =	0x22	/* returns the priority for a given label. Requires exact match */
 };
+#ifdef LOW_MEMORY
 #define AST_PBX_MAX_STACK  128
+#else
+#define AST_PBX_MAX_STACK  512
+#endif
 
 /* request and result for pbx_find_extension */
 struct pbx_find_info {

include/asterisk/pbx.h

@@ -1548,7 +1548,12 @@ enum ext_match_t {
 #define STATUS_NO_PRIORITY	3
 #define STATUS_NO_LABEL		4
 #define STATUS_SUCCESS		5
+
+#ifdef LOW_MEMORY
 #define AST_PBX_MAX_STACK  128
+#else
+#define AST_PBX_MAX_STACK  512
+#endif
 
 /* request and result for pbx_find_extension */
 struct pbx_find_info {