Audit and remove if possible uses of array new[]

‡ git grep -- "delete\[\]"

daemon/breakpad_win32.cc:    delete[] wc_minidump_dir;

engines/ep/src/couch-kvstore/couch-kvstore.cc:            delete[] buffer;

engines/ep/src/couch-kvstore/couch-kvstore.cc:    delete[] buffer;

engines/ep/src/defragmenter.cc:    delete[] stats.ext_stats;

engines/ep/src/executorpool.cc:    delete[] curWorkers;

engines/ep/src/executorpool.cc:    delete[] numWorkers;

engines/ep/src/executorpool.cc:    delete[] numReadyTasks;

engines/ep/src/ext_meta_parser.cc:        delete[] data;

engines/ep/src/failover-table.cc:    delete[] logentries;

engines/ep/src/memory_tracker.cc:    delete[] stats.ext_stats;

engines/ep/src/mutation_log.h:                delete[] mle;

engines/ep/src/storeddockey.h:            delete[] reinterpret_cast<uint8_t*>(p);

tests/memory_tracking_test/memory_tracking_plugin.cc:    delete[] ptr;

tests/memory_tracking_test/memory_tracking_test.cc:    // Test new[] & delete[] //////////////////////////////////////////////

tests/memory_tracking_test/memory_tracking_test.cc:    delete[] ptr;