🍒[build] Respect DEPLOYMENT_VERSION_{IOS|TVOS|WATCHOS}
for Simulator targets
#78269
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Explanation: This makes sure that Cxx and CxxStdlib modules are built with consistent deployment targets for iOS Simulator and iOS Device. This fixes a regression introduced in b87b263, which caused the Cxx and CxxStdlib binaries to have a deployment target version that is too new.
Scope: This changes the CMake build scripts to pass the correct
-target
flag to swiftc when building binaries for Simulator.Risk: Low, this only changes the build script for CMake targets that override iOS/tvOS/watchOS deployment target.
Testing: Added compiler tests.
Issue: rdar://141232269
Reviewer: @Xazax-hun
Original PR: #78242