Remove unused function

PQExpBuffers used to generate SQL, no need to worry about maximum
query length and more flexible for generating dynamic queries.

strutil.c

@@ -35,19 +35,6 @@ xvsnprintf(char *str, size_t size, const char *format, va_list ap)
 }
 
 
-int
-sqlquery_snprintf(char *str, const char *format,...)
-{
-	va_list		arglist;
-	int			retval;
-
-	va_start(arglist, format);
-	retval = xvsnprintf(str, MAX_QUERY_LEN, format, arglist);
-	va_end(arglist);
-
-	return retval;
-}
-
 int
 maxlen_snprintf(char *str, const char *format,...)
 {