Default to KDE/4.7 for kdelibs

kdesrc-buildrc-sample

@@ -222,6 +222,12 @@ module-set
 #	cmake-options -DKDE4_BUILD_TESTS:BOOL=ON
 end module-set
 
+# kdelibs was actually defined earlier, in the module set above. This module is
+# only used to set the "branch" option.
+module kdelibs
+    branch KDE/4.7
+end module
+
 # The next module-set completes a base workspace. kdepimlibs should be compiled
 # before the workspace and Plasma addons are compiled, and kdepimlibs itself
 # requires akonadi.