[lldb-dev] Minors fixes

[Jean-Daniel Dupas]

Here are 2 patches to make clang++ happy.

Explicitly use lldb::pid_t instead of letting the compiler choose between ::pid_t and lldb::pid_t.
In fact, most pid_t declarations already use the lldb:: prefix except the 3 updated by this patch.
It fixes a clang++ error which didn't know which type to choose between ::pid_t and lldb::pid_t. 

The second patch rename an argument in a method declaration to avoid duplicate names (something else that clang++ really doesn't like).

I don't know if these errors are due to clang++ bugs or just because clang++ is stricter than GCC.

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-- Jean-Daniel