Avoid warnings while generating the parser

src/parser/Makefile.am

@@ -1,6 +1,8 @@
 
 noinst_LTLIBRARIES = libmodsec_parser.la
 
+AM_YFLAGS = $(CUSTOM_YFLAGS)
+
 BUILT_SOURCES = \
 	seclang-parser.cc \
 	test.cc

src/parser/seclang-parser.yy

@@ -1,7 +1,7 @@
 %skeleton "lalr1.cc" /* -*- C++ -*- */
 %require "3.0.2"
 %defines
-%define parser_class_name {seclang_parser}
+%define api.parser.class {seclang_parser}
 %define api.token.constructor
 %define api.value.type variant
 //%define api.namespace {modsecurity::yy}