* [msbuild] Support ibtool output when it adds ~ipad or ~iphone modifiers
When targetting older iOS versions (such as iOS 7) for multiple
device targets (e.g. iphone, ipad, etc), ibtool will output
multiple directories using the basename of the original ib file
and add ~ipad or ~iphone blurbs to the filename.
This was causing the linking step to fail due to paths not being
found at the expected locations.
* [msbuild] Added unit tests for ibtool --link w/ --minimum-deployment-target 7.0
Since pre-iOS 8.0 does not support size classes in storyboards,
ibtool will output LaunchScreen~ipad.nib and LaunchScreen~iphone.nib.
This test will fail if the IBTool logic does not properly determine
the outputs to pass to a final ibtool --link command to link all of
the storyboards together.
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