only build exception_tracer on elf platforms with libdwarf
Summary: FOLLY_USE_SYMBOLIZER is too coarse of a flag to determine whether ExceptionTracer is available. Instead, use FOLLY_HAVE_ELF and FOLLY_HAVE_DWARF. Reviewed By: yfeldblum, luciang Differential Revision: D23361407 fbshipit-source-id: 2326f185c98f58e7afb007befc9121a365c22e77
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