CMake: Add LD_LIBRARY support

Extract all the information necessary for the "Add build library search path
to LD_LIBRARY_PATH" from fileapi and enable the relevant UI in the
desktop run configuration.

This allows to remove a workaround introduced for QTCREATORBUG-19354.

Note that this is only supported by fileapi at this time.

Task-number: QTCREATORBUG-23464
Change-Id: I390d26ed8cd559bd7ff8c2701cd3b1cb8e764339
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

src/plugins/cmakeprojectmanager/cmakebuildtarget.h

@@ -57,6 +57,7 @@ public:
     Utils::FilePath workingDirectory;
     Utils::FilePath sourceDirectory;
     Utils::FilePath makeCommand;
+    Utils::FilePaths libraryDirectories;
 
     Backtrace backtrace;