Simplify isc_mem_create() to always use defaults and never fail
Previously, the isc_mem_create() and isc_mem_createx() functions took `max_size` and `target_size` as first two arguments. Those values were never used in the BIND 9 code. The refactoring removes those arguments and let BIND 9 always use the default values. Previously, the isc_mem_create() and isc_mem_createx() functions could have failed because of failed memory allocation. As this was no longer true and the functions have always returned ISC_R_SUCCESS, the have been refactored to return void.
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