fix use of constant initializer for static xml handle counter (#4117)

Currently in procedure.c static variable current_xml_handle_counter is assigned to a const int variable which is causing build failures for gcc version 7.3.1. Updated the constant variable declarations to MACRO.

Signed-off-by: Rohit Bhagat [email protected]

Author: rohit01010

contrib/babelfishpg_tsql/src/procedures.c

@@ -119,9 +119,9 @@ static bool is_supported_case_sp_describe_undeclared_parameters = true;
 #define Anum_xml_handle_temp_table_ns_data 7
 
 #define MD5_HASH_LEN 32
+#define XML_HANDLE_COUNTER_START 0
+#define XML_HANDLE_COUNTER_INVALID (INT_MAX / 2)
 
-const  int   XML_HANDLE_COUNTER_START = 0;
-const  int   XML_HANDLE_COUNTER_INVALID = INT_MAX / 2;
 static int   current_xml_handle_counter = XML_HANDLE_COUNTER_INVALID;
 Bitmapset   *active_xml_handles_counter = NULL;
 static char *xml_handle_temp_table_name = NULL;