xcode: add xcodepostbuildinputs/xcodepostbuildoutputs API for Postbuild script phase

[mrpuzzler]

Problem

GENie's postbuildcommands generates a PBXShellScriptBuildPhase with empty inputPaths and outputPaths. Xcode 15+ warns on every build:

"Run script build phase 'Postbuild' will be run during every build because it does not specify any outputs. To address this issue, either add output dependencies to the script phase, or configure it to run in every build by unchecking 'Based on dependency analysis'."

The workaround in the previous PR (#594) was alwaysOutOfDate = 1, which silences the warning but means the script always runs even when nothing changed.

Solution

Add two new Xcode-specific Lua API fields, mirroring the pattern of xcodescriptphases:

xcodepostbuildinputs  { ... }   -- fills inputPaths  for the Postbuild phase
xcodepostbuildoutputs { ... }   -- fills outputPaths for the Postbuild phase

When xcodepostbuildoutputs is non-empty, alwaysOutOfDate is omitted and Xcode uses its dependency analysis (stamp-file pattern). When no outputs are declared the previous alwaysOutOfDate = 1 behaviour is preserved for full backward compatibility.

Usage — stamp-file pattern

postbuildcommands {
    '"${SRCROOT}/../../scripts/copy_game_data.sh"'
}
-- Xcode skips the script entirely when runtime/ hasn't changed since last build.
xcodepostbuildinputs  { '"$(SRCROOT)/../../runtime/mundus/"' }
xcodepostbuildoutputs { '"$(DERIVED_FILE_DIR)/game_data.stamp"' }

The copy script creates the stamp at the end:

touch "${DERIVED_FILE_DIR}/game_data.stamp"

Changes

• src/base/api.lua — register xcodepostbuildinputs (list) and xcodepostbuildoutputs (list)
• src/actions/xcode/xcode_common.lua:
  • doblock gains an outputfiles parameter, populates outputPaths, and only emits alwaysOutOfDate when no outputs are declared
  • dobuildblock gains inputswhich/outputswhich parameters and reads those config fields
  • Postbuild call passes "xcodepostbuildinputs" / "xcodepostbuildoutputs"

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