Merge topic 'ios-universal'

Help/manual/cmake-properties.7.rst

Help/manual/cmake-variables.7.rst

Help/prop_tgt/IOS_INSTALL_COMBINED.rst

Help/release/dev/ios-universal.rst

Help/variable/CMAKE_IOS_INSTALL_COMBINED.rst

Modules/CMakeIOSInstallCombined.cmake

Source/cmInstallTargetGenerator.cxx

Source/cmInstallTargetGenerator.h

Source/cmTarget.cxx

Tests/RunCMake/XcodeProject/RunCMakeTest.cmake

.../XcodeProject/XcodeIOSInstallCombined-install-check.cmake

Tests/RunCMake/XcodeProject/XcodeIOSInstallCombined.cmake

...eProject/XcodeIOSInstallCombinedPrune-install-check.cmake

...deProject/XcodeIOSInstallCombinedPrune-install-stdout.txt

.../RunCMake/XcodeProject/XcodeIOSInstallCombinedPrune.cmake

Tests/RunCMake/XcodeProject/main.cpp