more travis debug

dlib/travis/build-and-test.sh

@@ -40,6 +40,7 @@ if [ "$VARIANT" = "old-cmake" ]; then
   ls ../cmake/2.8
   ls ../cmake/2.8/bin/
   ls -l ../cmake/2.8/bin/cmake
+  ls -l ../cmake/2.8/bin/cmake 
   ../cmake/2.8/bin/cmake ../dlib/test/tools 
   ../cmake/2.8/bin/cmake --build .  -- -j 2
 

dlib/travis/get-old-cmakes.sh

@@ -9,7 +9,6 @@ if [ ! -x cmake/2.8/bin/cmake ] || [ ! -x cmake/3.1/bin/cmake ] || [ ! -x cmake/
     rm -rf cmake
 fi
 
-    rm -rf cmake
 
 if [[ ! -d cmake ]]; then
   echo "Downloading cmake..."