CMake build: Add unittest CMake build files

On MinGW 8.1 I get the following after running ctest -j 40

99% tests passed, 35 tests failed out of 2631

Change-Id: I2c3ce7940b036e52ef393feab5837886355e7b5a
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/tools/clangrefactoringbackend/source/CMakeLists.txt

@@ -0,0 +1,47 @@
+add_qtc_library(clangrefactoringbackend_lib STATIC
+  DEPENDS libclang clangTooling clangIndex clangQuery ClangSupport
+  DEFINES CLANGSUPPORT_BUILD_LIB
+  PUBLIC_INCLUDES
+    ${CLANG_INCLUDE_DIRS}
+    "../../clangpchmanagerbackend/source"
+  SOURCES
+    clangquery.cpp clangquery.h
+    clangquerygatherer.cpp clangquerygatherer.h
+    clangrefactoringbackend_global.h
+    clangtool.cpp clangtool.h
+    collectmacrospreprocessorcallbacks.h
+    collectmacrossourcefilecallbacks.cpp collectmacrossourcefilecallbacks.h
+    collectsymbolsaction.cpp collectsymbolsaction.h
+    filestatus.h
+    filestatuscache.cpp filestatuscache.h
+    findcursorusr.h
+    findlocationsofusrs.h
+    findusrforcursoraction.cpp findusrforcursoraction.h
+    indexdataconsumer.cpp indexdataconsumer.h
+    locationsourcefilecallbacks.cpp locationsourcefilecallbacks.h
+    macropreprocessorcallbacks.cpp macropreprocessorcallbacks.h
+    projectpartentry.h
+    refactoringcompilationdatabase.cpp refactoringcompilationdatabase.h
+    refactoringserver.cpp refactoringserver.h
+    sourcedependency.h
+    sourcelocationentry.h
+    sourcelocationsutils.h
+    sourcerangeextractor.cpp sourcerangeextractor.h
+    sourcerangefilter.cpp sourcerangefilter.h
+    sourcesmanager.h
+    symbolentry.h
+    symbolfinder.cpp symbolfinder.h
+    symbolindexer.cpp symbolindexer.h
+    symbolindexertask.h
+    symbolindexertaskqueue.h
+    symbolindexertaskqueueinterface.h
+    symbolindexing.cpp symbolindexing.h
+    symbolindexinginterface.h
+    symbollocationfinderaction.cpp symbollocationfinderaction.h
+    symbolscollector.cpp symbolscollector.h
+    symbolscollectorinterface.h
+    symbolstorage.h
+    symbolstorageinterface.h
+    symbolsvisitorbase.h
+    usedmacro.h
+)