Issue #50, Add a dummy unittest for cmake to make Qt5.3.2 happy

The error is caused by Qt base SHA:
c2c90b95bf8304e69a5f0a586c607105cc104f83

tests/auto/auto.pro

@@ -12,4 +12,5 @@ SUBDIRS=\
     format \
     richstring \
     xlsxconditionalformatting \
-    cellreference
+    cellreference \
+    cmake

tests/auto/cmake/CMakeLists.txt

@@ -0,0 +1,9 @@
+
+cmake_minimum_required(VERSION 2.8)
+
+project(qmake_cmake_files)
+
+enable_testing()
+
+add_test(dummy ${CMAKE_COMMAND} -E echo)
+

tests/auto/cmake/cmake.pro

@@ -0,0 +1,7 @@
+
+# Cause make to do nothing.
+TEMPLATE = subdirs
+
+CMAKE_QT_MODULES_UNDER_TEST = xlsx
+
+CONFIG += ctest_testcase