Squashed 'deps/ccommon/' changes from 4a3a0fd..bb298bc

bb298bc make CHECK_INCLUDES optional; add to include only when present & working

git-subtree-dir: deps/ccommon
git-subtree-split: bb298bc

CMakeLists.txt

@@ -122,15 +122,15 @@ find_package(Threads)
 # where to find include files
 include_directories(${include_directories}
     "${PROJECT_BINARY_DIR}"
-    "include"
-    "${CHECK_INCLUDES}")
+    "include")
 
 ###################
 # things to build #
 ###################
 
 add_subdirectory(src)
 if(CHECK_WORKING)
+    include_directories(${include_directories} "${CHECK_INCLUDES}")
     add_subdirectory(test)
 endif(CHECK_WORKING)