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Multiple versions of Xcode may be installed in different locations.
Run "xcode-select --print-path" to detect the active Xcode location
and parse its Contents/version.plist file.  Note that the Xcode.app
directory name may vary in developer versions.

In cmGlobalXCodeGenerator::Generate we generate a .xcodeproj for each
directory in the tree containing a project() command.  First we
iteratively use SetGenerationRoot to add "ALL_BUILD" and other targets
to each project.  This leaves "CurrentProject" set to the last project
when we invoke cmGlobalGenerator::Generate, which is not the same as the
top-level project if any subdirectories invoke the project() command.

When cmGlobalGenerator::Generate reaches CreateGeneratorTargets it
constructs cmGeneratorTarget and calls ComputeTargetObjects exactly once
per target.  In this context the value of CurrentProject is undefined so
we cannot pass it to GetObjectsNormalDirectory.  Use "$(PROJECT_NAME)"
instead so it will adapt automatically to each project.

Also teach Tests/ObjectLibrary to cover this case.

Don't create linked resources which point to CMAKE_BINARY_DIR
itself or one of its parent dirs. Eclipse complained about that.

Alex

This was introduced by 5d885db4.

When a search path contains multiple "lib/" instances we previously
converted all or none.  This fails for cases where only some of the
multiple instances must be converted.  Teach AddArchitecturePaths to
generate all combinations that exist.  Uncomment these cases in the
CMakeOnly.find_library test now that they work.

Simplify cmFindLibraryCommand::AddArchitecturePaths logic to avoid
recording a separate 'found' status and populating an entire
vector<string> just to throw it away.

Previously methods AddArchitecturePaths and AddLib64Paths were almost
identical.  Replace the latter with a call to the former.  Fix the
AddArchitecturePaths implementation to add trailing slashes to all
tested paths.

Using OUTPUT_MERGE can cause the output to be jumbled in some cases.