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.

tests/input.at

@@ -1833,14 +1833,14 @@ AT_SETUP([["%define" Boolean variables]])
 
 AT_DATA([Input.y],
 [[%language "Java"
-%define public maybe
 %define api.parser.class {Input}
+%define api.parser.public {maybe}
 %%
 start: %empty;
 ]])
 
 AT_BISON_CHECK([[Input.y]], [1], [],
-[[Input.y:2.9-14: error: invalid value for %define Boolean variable 'public'
+[[Input.y:3.9-25: error: invalid value for %define Boolean variable 'api.parser.public'
 ]])
 
 AT_CLEANUP