Update systemjs-builder to version 0.15.12 🚀

[greenkeeperio-bot]

Hello 👋

🚀🚀🚀

systemjs-builder just published its new version 0.15.12, which is not covered by your current version range.

If this pull request passes your tests you can publish your software with the latest version of systemjs-builder – otherwise use this branch to work on adaptions and fixes.

Happy fixing and merging 🌴

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The new version differs by 43 commits .

• 7345bf6 0.15.12
• f83f52e relax condition system module detection
• 1c0053f fix conditional system fallback modules
• f52686f 0.15.11
• 9a5e36c update global helpers to handle exports as an array
• 6e9fbd4 package map does chain
• 8fc2e90 require.resolve support
• fac9748 create opts.uglify with opts.uglify.compress and opts.uglify.beautify passed through
• 6d21c8a only support encodeNames for buildStatic
• d3d7588 ensure plugin sytanx is properly canonicalized
• 08f69b9 ensure sfx externals have deterministic ordering
• da444c9 depcache to be unnormalized dependencies
• 9d479e7 remove use of basePath in tests
• f024acf fix amd factory function tracing
• 2e42b9c fix up package mapping for conditionals

There are 43 commits in total. See the full diff.

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