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
495a46aa1dc564656bf919cb49aae48a31ae15f4.

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/dev/genfiles b/scripts/dev/genfiles
index 4e3a6d62e0..c633429e0f 100755
--- a/scripts/dev/genfiles
+++ b/scripts/dev/genfiles
@@ -35,7 +35,7 @@
 
 # Parser generator
 YACC=${YACC:-bison}
-YACC="$YACC -y -l"
+YACC="$YACC -l"
 
 # Lexer generator
 RE2C=${RE2C:-re2c}