Make lldb-gdbserver configure/(g)make build parity with cmake.

This now builds lldb-gdbserver on all Linux and FreeBSD architectures
rather than being locked to x86_64 architectures only.

Please note lldb-gdbserver is not yet functional, this just enables
the non-x86_64 Linux/FreeBSD build using the configure/make build
system.

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M    tools/Makefile