java/d: rename some %define variables for consistency

See 890ee8a1fd and
https://lists.gnu.org/archive/html/bison-patches/2019-01/msg00024.html.

* data/skeletons/d.m4, data/skeletons/java.m4
(abstract, annotations, extends, final, implements, public, strictfp):
Rename as...
(api.parser.abstract, api.parser.annotations, api.parser.extends)
(api.parser.final, api.parser.implements, api.parser.public)
(api.parser.strictfp):
these.

* src/muscle-tab.c (muscle_percent_variable_update): Ensure backward
compatibility.

* doc/bison.texi, examples/d/calc.y, examples/java/Calc.y,
tests/input.at: Adjust.

examples/d/calc.y

@@ -1,8 +1,6 @@
 %language "D"
 
 %define api.parser.class {Calc}
-%define public
-
 %define parse.error verbose
 
 %code imports {

examples/java/Calc.y

@@ -1,7 +1,7 @@
 %language "Java"
 
 %define api.parser.class {Calc}
-%define public
+%define api.parser.public
 
 %define parse.error verbose
 %locations