Fix GH-12621: browscap segmentation fault when configured in the vhost

The temporary HashTable has a destructor that releases the string held
by the entry's value. However, browscap_inte

Fix GH-12621: browscap segmentation fault when configured in the vhost

The temporary HashTable has a destructor that releases the string held
by the entry's value. However, browscap_intern_str(_ci) only incremented
the refcount for the reference created by the return value. As the
HashTable is only used during parsing, we don't need to manage the
reference count of the value anyway, so get rid of the destructor.

This is triggerable in two cases:
- When using php_admin_value to set the ini at the activation stage
- When running out of space for the opcache-interned strings

Closes GH-12634.

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