Get triple from the make variable CC_TARGET_TRIPLE #1558
Merged
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Allow overriding the target triple used by the Xcode Swift toolchain through the CC_TARGET_TRIPLE environment variable. As cc_toolchain.target_gnu_system_name is getting deprecated, and as rules based toolchain currently don't offer the option to set it anymore, this offers a way by which someone can define a rules based toolchain and still have working swift rules.