Fix FTBFS for build out of source #4

Several problems are solved here:

FTBFS, if new *.c files are generated for lexer or parser – thank you Michele for your patch.
When generating a new parser.c, it is also appropriate to generate parser.h to make these files consistent. Therefore, the default make rule is not sufficient, but explicit rule is needed.
There was inconsistency in the definition of constants between parser.h and parser.c contained in the source tree. If the new parser.h has been automatically generated, it caused FTBFS in the lexer.
None of these generated files may be part of the source tree.

Several problems are solved here: 1. FTBFS, if new `*.c` files are generated for lexer or parser – thank you Michele for your patch. 2. When generating a new `parser.c`, it is also appropriate to generate `parser.h` to make these files consistent. Therefore, the default make rule is not sufficient, but explicit rule is needed. 3. There was inconsistency in the definition of constants between `parser.h` and `parser.c` contained in the source tree. If the new `parser.h` has been automatically generated, it caused FTBFS in the lexer. 4. None of these generated files may be part of the source tree.

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Fix FTBFS for build out of source #4

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