Utils: Fix qbs build.

Change-Id: Ie1dc9ff882753730d7872bb61e23cde27e13939c
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/libs/utils/utils.qbs

@@ -57,6 +57,8 @@ QtcLibrary {
         "detailswidget.h",
         "elfreader.cpp",
         "elfreader.h",
+        "elidinglabel.cpp",
+        "elidinglabel.h",
         "environment.cpp",
         "environment.h",
         "environmentmodel.cpp",