mac autoconf: support current and future SDKs (#470)

Improve the way we generate the path to the SDK so that it
it not tied to specific Mac versions.

Also changed macosx-version-min to 10.6

Fixes #378
Fixes #468

Use xcrun instead of xcodebuild

Note that "configure" was generated using autoconf on Linux.
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Phil Burk 2021-01-26 15:25:10 -08:00 committed by GitHub
commit fa525d6199
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3 changed files with 6 additions and 34 deletions

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