try these python changes, because python was not found by CMake, and …

…pip install --user was returning an error as --user not accepted in venv

appveyor.yml

@@ -13,8 +13,8 @@ stack: python 3.9
 install:
   - sh: |
       git submodule update --init
-      python -m pip install --user -r ext/gudhi-deploy/build-requirements.txt
-      python -m pip install --user -r ext/gudhi-deploy/test-requirements.txt
+      python -m pip install -r ext/gudhi-deploy/build-requirements.txt
+      python -m pip install -r ext/gudhi-deploy/test-requirements.txt
       python -m pip uninstall -y pykeops
       brew update || true
       brew install ninja graphviz doxygen boost eigen gmp mpfr tbb cgal || true
@@ -24,7 +24,7 @@ build_script:
       mkdir build
       cd build
       which python
-      cmake -DCMAKE_BUILD_TYPE:STRING=$(cmakeBuildType) $(extraCmakeOptions) -GNinja $(gudhiCmakeOptions) ..
+      cmake -DCMAKE_BUILD_TYPE:STRING=$(cmakeBuildType) -GNinja $(gudhiCmakeOptions) ..
       ninja
       ninja doxygen
       ctest --output-on-failure