CMake Nightly Date Stamp
Xcode: Generate recommended artwork setting (#13954)

Add the COMBINE_HIDPI_IMAGES = YES setting to all Xcode project targets.
Otherwise Xcode may ask the user to "Update to recommended settings".
Only add existing targets to the Qt4 target depends properties.

Qt can be configured in ways which disable certain modules. Make
sure we don't fail on that.
Merge topic 'non-fatal-Qt4-missing-targets' into next

4d5230d Only add existing targets to the Qt4 target depends properties.
793bf3f CMake Nightly Date Stamp
Merge topic 'xcode-COMBINE_HIDPI_IMAGES' into next

10d7bf4 Xcode: Generate recommended artwork setting (#13954)