Upgrade deprecated directives and use non-posix bison

With Bison 3.0 some directives are deprecated:
- %name-prefix "x" should be %define api.prefix {x}
- %error-verbose should be %define parse.error verbose

Bison 3.3 also started emiting more warnings and since PHP souce parsers
are not POSIX compliant this patch fixes this as pointed out via
495a46a.

Author: petk

Diff for: ext/json/json_parser.y

@@ -47,7 +47,7 @@ int json_yydebug = 1;
 }
 
 %pure-parser
-%name-prefix "php_json_yy"
+%define api.prefix {php_json_yy}
 %lex-param  { php_json_parser *parser  }
 %parse-param { php_json_parser *parser }
 

Diff for: sapi/phpdbg/phpdbg_parser.y

@@ -29,7 +29,7 @@ ZEND_EXTERN_MODULE_GLOBALS(phpdbg)
 %}
 
 %pure-parser
-%error-verbose
+%define parse.error verbose
 
 %code requires {
 #include "phpdbg.h"

Diff for: scripts/dev/genfiles

@@ -35,7 +35,7 @@
 
 # Parser generator
 YACC=${YACC:-bison}
-YACC="$YACC -y -l"
+YACC="$YACC -l"
 
 # Lexer generator
 RE2C=${RE2C:-re2c}