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Cleanup: delete unused IntSetToString
It was added in http://cr/19491949 (and was referenced at the time).
The last reference was removed in http://cr/19507363.This fixes warning/error with pre-release crosstoolv18:
'std::string leveldb::{anonymous}::IntSetToString(const std::set<long unsigned int>&)' defined but not used [-Werror=unused-function] -
Added arm64 and and armv7s to IOS build as suggested on leveldb mailing list.
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Changed local variable type from int to size_t
This eliminates compiler warning/error and resolves issue #146