- Also patch the file from which var_unserializer.c is generated

Fix two incidents which have been reported about the new unserializer.

#1: forgot to handle negative numbers
#2: added zval_ptr_dtor which was not in the original code which
migh

Fix two incidents which have been reported about the new unserializer.

#1: forgot to handle negative numbers
#2: added zval_ptr_dtor which was not in the original code which
might lead to crash

PR: #14082

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Rewrite of unserializer which should be more maintainable and extensible.

Changes pass `make test´ and a couple of custom tests.

Enjoy.