CMake: Improve cmake setup on Apple

Users tend to select cmake.app, which is actually a GUI for cmake and
not what Creator expects. So check for the proper binary in the bundle
and return that if it exists.

Change-Id: I1668baa6236ee4ae88da200cef257b636f7a9e72
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmaketool.cpp

@@ -139,6 +139,12 @@ QVariantMap CMakeTool::toMap() const
 
 Utils::FileName CMakeTool::cmakeExecutable() const
 {
+    if (Utils::HostOsInfo::isMacHost() && m_executable.endsWith(".app")) {
+        Utils::FileName toTest = m_executable;
+        toTest = toTest.appendPath("Contents/bin/cmake");
+        if (toTest.exists())
+            return toTest;
+    }
     return m_executable;
 }