graphics/darktable: Add patch to support LLVM/Clang 3.7.0
PR:		202594
Reviewed by:	bapt, kwm
Approved by:	bapt
Differential Revision:	https://reviews.freebsd.org/D3247
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graphics/darktable: Add patch to support LLVM/Clang 3.7.0 Tags None Referenced Files None Subscribers None 
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