c++: fix old cast warnings

We still have a few old C casts in lalr1.cc, let's get rid of them.
Reported by Frank Heckenbach.

Actually, let's monitor all our casts using easy to grep macros.
Let's use these macros to use the C++ standard casts when we are in
C++.

* data/skeletons/c.m4 (b4_cast_define): New.
* data/skeletons/glr.c, data/skeletons/glr.cc,
* data/skeletons/lalr1.cc, data/skeletons/stack.hh,
* data/skeletons/yacc.c:
Use it and/or its casts.

* tests/actions.at, tests/cxx-type.at,
* tests/glr-regression.at, tests/headers.at, tests/torture.at,
* tests/types.at:
Use YY_CAST instead of C casts.

* configure.ac (warn_cxx): Add -Wold-style-cast.
* doc/bison.texi: Disable it.

tests/headers.at

@@ -322,6 +322,7 @@ AT_PERL_CHECK([[-n -0777 -e '
       |YYPUSH_MORE(?:_DEFINED)?
       |YYUSE
       |YY_ATTRIBUTE(?:_PURE|_UNUSED)
+      |YY(?:_REINTERPRET)?_CAST
       |YY_CONSTEXPR
       |YY_COPY
       |YY_CPLUSPLUS