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53991ecc14
This commit does several changes to isc_symtab: 1. Rewrite the isc_symtab to internally use isc_hashmap instead of hand-stiched hashtable. 2. Create a new isc_symtab_define_and_return() api, which returns the already defined symvalue on ISC_R_EXISTS; this allows users of the API to skip the isc_symtab_lookup()+isc_symtab_define() calls and directly call isc_symtab_define_and_return(). 3. Merge isccc_symtab into isc_symtab - the only missing function was isccc_symtab_foreach() that was merged into isc_symtab API. 4. Add full set of unit tests for the isc_symtab API.