DRTVWR-575: Forbid Xcode 14.1 from implicitly signing every target.

Or rather, attempting to implicitly sign. On TeamCity we must explicitly sign
using viewer_manifest.py. On a developer system, without these changes, Xcode
produces many errors of the form:
error: An empty identity is not valid when signing a binary for the product
type 'Command-line Tool'. (in target 'INTEGRATION_TEST_lldir' from project
'SecondLife')
and refuses to compile anything at all.

Thanks to Rye Mutt and NickyD. Also thanks Geir Nøklebye for additional
settings to help tame Xcode 14.1 warnings.

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