edify: update for bison 3.5

Getting rid of warning, so using new define for turning on verbose
errors:
%define parse.error verbose

Bug: 31194194
Test: N/A
Change-Id: I47c200a1e669b5c5fc53d392f32b4c264a42182d
diff --git a/edify/parser.yy b/edify/parser.yy
index 3a63c37..37bcdd0 100644
--- a/edify/parser.yy
+++ b/edify/parser.yy
@@ -72,7 +72,7 @@
 
 %parse-param {std::unique_ptr<Expr>* root}
 %parse-param {int* error_count}
-%error-verbose
+%define parse.error verbose
 
 /* declarations in increasing order of precedence */
 %left ';'