Akim Demaille 3dcfb4fd88 java: prefer null to YYSYMBOL_YYEMPTY ...

That's one nice benefit from using enums.

* data/skeletons/lalr1.java (YYSYMBOL_YYEMPTY): No longer define it.
Use 'null' instead.
* examples/java/calc/Calc.y, tests/local.at: Adjust.

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..

Calc.test

examples: java: use explicit token identifiers

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Calc.y

java: prefer null to YYSYMBOL_YYEMPTY

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local.mk

java: examples: split in two

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Makefile

java: examples: split in two

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