[patch] Reduce size of clang-format by 87% on OS X

[Nico Weber]

Hi,

the attached patch turns on link-time dead code stripping for clang-format,
with the configure/make build. This reduces the size of clang-format from
13MB to 1.6MB.

Ok?

Nico

ps: The equivalent on linux is I think compiling with -ffunction-sections
-fdata-sections and linking with -Wl,-gc-sections, but I don't have access
to a linux box to try this at the moment.
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