Path: Add support for mach-o reader to be aware of .debug_gdb_scripts

[Bill Neubauer]

This patch adds functionality to the Mach-O reader to be aware of the
.debug_gdb_scripts section produced in Mac OS X binaries by the Go
toolchain. This issue is documented in more detail at
https://code.google.com/p/go/issues/detail?id=4194
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