fix snapcraft build using recent cmake

snapcraft.yaml

@@ -28,15 +28,29 @@ apps:
       - mount-observe
 
 parts:
-  meshlab:
-    #plugin: qmake
-    #qt-version: qt5
-    #source: https://github.com/cnr-isti-vclab/meshlab.git
-    source: https://github.com/cnr-isti-vclab/meshlab.git
-    build-snaps: [cmake]
+  cmake:
+    source: https://github.com/Kitware/CMake
+    source-type: git
+    source-depth: 1
     plugin: cmake
+    stage-packages:
+      - libssl-dev
+    override-build: |
+      mkdir -p build
+      cd build
+      cmake \
+        -DCMAKE_INSTALL_PREFIX=$SNAPCRAFT_STAGE/cmake \
+        $SNAPCRAFT_PART_SRC
+      make -j 4
+      make install
+
+  meshlab:
+    after: [cmake]
+    plugin: qmake
+    qt-version: qt5
+    source: https://github.com/cnr-isti-vclab/meshlab.git
     build-packages:
-      - cmake
+      #- cmake
       - qt5-default
       - qttools5-dev-tools
       - qtdeclarative5-dev