Specify function pointer signature for scanf implementation

Fix [-Wstrict-prototypes] warnings in standard/scanf.c

Author: Girgias

ext/standard/scanf.c

@@ -106,6 +106,8 @@ typedef struct CharSet {
 	} *ranges;
 } CharSet;
 
+typedef zend_long (*int_string_formater)(const char*, char**, int);
+
 /*
  * Declarations for functions used only in this file.
  */
@@ -583,7 +585,7 @@ PHPAPI int php_sscanf_internal( char *string, char *format,
 	int  base = 0;
 	int  underflow = 0;
 	size_t width;
-	zend_long (*fn)() = NULL;
+	int_string_formater fn = NULL;
 	char *ch, sch;
 	int  flags;
 	char buf[64];	/* Temporary buffer to hold scanned number
@@ -740,29 +742,29 @@ PHPAPI int php_sscanf_internal( char *string, char *format,
 			case 'D':
 				op = 'i';
 				base = 10;
-				fn = (zend_long (*)())ZEND_STRTOL_PTR;
+				fn = (int_string_formater)ZEND_STRTOL_PTR;
 				break;
 			case 'i':
 				op = 'i';
 				base = 0;
-				fn = (zend_long (*)())ZEND_STRTOL_PTR;
+				fn = (int_string_formater)ZEND_STRTOL_PTR;
 				break;
 			case 'o':
 				op = 'i';
 				base = 8;
-				fn = (zend_long (*)())ZEND_STRTOL_PTR;
+				fn = (int_string_formater)ZEND_STRTOL_PTR;
 				break;
 			case 'x':
 			case 'X':
 				op = 'i';
 				base = 16;
-				fn = (zend_long (*)())ZEND_STRTOL_PTR;
+				fn = (int_string_formater)ZEND_STRTOL_PTR;
 				break;
 			case 'u':
 				op = 'i';
 				base = 10;
 				flags |= SCAN_UNSIGNED;
-				fn = (zend_long (*)())ZEND_STRTOUL_PTR;
+				fn = (int_string_formater)ZEND_STRTOUL_PTR;
 				break;
 
 			case 'f':