Clang: Get file informations from symbols collector

We need the same information like file size and the last modification time
to check if a file has changed. This information will be saved to the
database.

Change-Id: Icf8eb9b6553945a563887e11aff9539c9b300b66
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/tools/clangrefactoringbackend/source/clangrefactoringbackend-source.pri

@@ -15,7 +15,8 @@ HEADERS += \
     $$PWD/collectmacrospreprocessorcallbacks.h \
     $$PWD/projectpartentry.h \
     $$PWD/symbolsvisitorbase.h \
-    $$PWD/usedmacro.h
+    $$PWD/usedmacro.h \
+    $$PWD/fileinformation.h
 
 !isEmpty(LIBTOOLING_LIBS) {
 SOURCES += \