Aron Budinszky 139d7f628e [Math] Remove use of deprecated methods.
This fixes a bug introduced by [e1afe22](e1afe22cfb) which caused failing builds on Xcode 12 due to use of deprecated methods.

Specifically: the related commit above deprecated the custom MDCMath-specific methods, but MDCMath.h itself continues to use those same deprecated methods. This causes builds to fail (v117, Xcode 12, included as a Pod); previous version with v116 or a custom version with my commit resolves the issue.

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Closes https://github.com/material-components/material-components-ios/pull/10091

COPYBARA_INTEGRATE_REVIEW=https://github.com/material-components/material-components-ios/pull/10091 from aronbudinszky:develop d8caae97a1777857dea959e34130b2af87ba4a61
PiperOrigin-RevId: 336098267
2020-10-08 09:19:54 -07:00
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