Fix iphonesimulator and armv6-darwin build targets.
Fix iphonesimulator and armv6-darwin build targets.

- iphonesimulator: IOS_VERSION_MIN was declared in the wrong place.
- armv6: linking via ld instead of CXX is basically required.

Change-Id: Iad187691f633dcf2bc3e3590e88084bb926edb76

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