SDK-1711 fix crash on iOS 12 when using the pre-built xcframework

[echo-branch]

Reference

SDK-1711 fix crash on iOS 12 when using the pre-built xcframework

Summary

Copies fix for linker issue from the Xamarin hotfix

Motivation

Xamarin uses the binary framework and is severely impacted by this crash.

Type Of Change

• Bug fix (non-breaking change which fixes an issue)

Testing Instructions

Integrate a test app using the pre-built xcframework
Run app on iOS 12, notice crash.

When using the version built with this change, the app should not crash.

cc @BranchMetrics/saas-sdk-devs for visibility.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (b7ab30a) 53.77% compared to head (b955e8c) 53.77%.
Report is 6 commits behind head on master.

Files	Patch %	Lines
BranchSDK/Branch.m	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1325      +/-   ##
==========================================
- Coverage   53.77%   53.77%   -0.01%     
==========================================
  Files          68       68              
  Lines       10086    10087       +1     
  Branches     3886     3886              
==========================================
  Hits         5424     5424              
- Misses       4409     4410       +1     
  Partials      253      253              

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[NidhiDixit09]

Tested on iOS 12 for dynamic frameworks as well as for static libs. It looks all good to me. For static ones user needs to specify -weak_framework LinkPresentation linker flags in build settings of the app.