FreeBSD/ports 7401f14 (r490680)devel/llvm38 Makefile, devel/llvm40 Makefile

Remove obsolete conflicts entries referencing clang-devel.
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+0-1devel/llvm38/Makefile
+0-1devel/llvm40/Makefile
+0-1devel/llvm50/Makefile
+0-1devel/llvm60/Makefile
+0-1devel/llvm70/Makefile
+0-55 files

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