[diem-fuzzer] Un-suppress leaks in libc
[diem-fuzzer] Un-suppress leaks in libc

Remove libc leaks from the list of LeakSanitizer suppressions. This
allows the fuzzer to report leaks of memory allocated with libc
functions such as `malloc` for primitive types such as `str`.

Closes: #8742

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,aptos-labs/aptos-core,libra/libra,aptos-labs/aptos-core,libra/libra,libra/libra,libra/libra,aptos-labs/aptos-core