build for iOS - KeyError: 'DEPLOYMENT_TARGET_CLANG_FLAG_NAME'

[fpattis]

pull request based on this issue: https://github.com/NativeScript/NativeScript/issues/9840 and this patch: https://github.com/NativeScript/ns-v8ios-runtime/commit/1e0c0cec0e9627cd72652208347e760809f7d1e1

PR Checklist

• [ ] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [x] There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it. - https://github.com/NativeScript/NativeScript/issues/9840
• [x] You have signed the CLA.
• [ ] All existing tests are passing: https://github.com/NativeScript/ios-runtime/blob/master/CONTRIBUTING.md#contribute-to-the-code-base
• [ ] Tests for the changes are included.

What is the current behavior?

What is the new behavior?

Fixes/Implements/Closes #[Issue Number].

[cla-bot[bot]]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign the CLA at https://www.nativescript.org/cla. CLA has not been signed by users: @fpattis. After signing the CLA, you can ask me to recheck this PR by posting @cla-bot check as a comment to the PR.

[NathanWalker]

@fpattis thank you! when you get a chance, do you mind signing the CLA?

[fpattis]

@fpattis thank you! when you get a chance, do you mind signing the CLA?

@NathanWalker I signed it. Thanks.

[rod750]

@cla-bot check

Just passing by, I have an app update on hold, tried to update to nativescript 7+ and build ios runtime with no success, this PR is my last hope. I will be very grateful when it is released.

[cla-bot[bot]]

The cla-bot has been summoned, and re-checked this pull request!

[richardman1]

When is this getting released in ios 6.5.5 version? I really need it