replace "git clone" by git submodules for dependencies management

because the workaround for the read only mode on the Windows file system
is unstable/inconsistent

.gitmodules

+[submodule "deps/evalhyd"]
+	path = deps/evalhyd
+	url = https://gitlab.irstea.fr/HYCAR-Hydro/evalhyd/evalhyd.git
+	branch = dev
+[submodule "deps/xtl"]
+	path = deps/xtl
+	url = https://github.com/xtensor-stack/xtl.git
+[submodule "deps/xtensor-python"]
+	path = deps/xtensor-python
+	url = https://github.com/xtensor-stack/xtensor-python.git
+[submodule "deps/xtensor"]
+	path = deps/xtensor
+	url = https://github.com/xtensor-stack/xtensor.git

evalhyd @ c7a39afa

+Subproject commit c7a39afa56f78cc64ea58c0502bdd74de53a0941

xtensor @ 545dd7aa

+Subproject commit 545dd7aa78104052bb8e45c3175efff313d477dc

xtensor-python @ 6a286681

+Subproject commit 6a286681c48c35d3df342f291938f4825b20c0a3

xtl @ fea39142

+Subproject commit fea39142693fbbc2ef19d75012bc6b46ef0a5f8c

setup.py

 import sys
 import os
-import subprocess
-import stat
-import shutil
 
 from pybind11.setup_helpers import Pybind11Extension, build_ext
 from setuptools import setup
@@ -13,52 +10,15 @@ import numpy
 with open("evalhyd/version.py", 'r') as fv:
     exec(fv.read())
 
-
 # vendor dependencies (unless told otherwise via environment variable)
-def git_clone(*args):
-    r = subprocess.run(
-        ['git', 'clone', *args, '-c', 'advice.detachedHead=false'],
-        capture_output=True
-    )
-    if r.returncode != 0:
-        raise RuntimeError(r.stderr.decode('utf-8'))
-
-
-def remove_readonly(func, path, exc):
-    # fix for Windows: change access permission for read-only files
-    # so that they can be removed
-    if not os.access(path, os.W_OK):
-        os.chmod(path, stat.S_IWUSR)
-        func(path)
-
-
-deps = [
-    ('xtl', '0.7.0',
-     'https://github.com/xtensor-stack/xtl'),
-    ('xtensor', '0.24.0',
-     'https://github.com/xtensor-stack/xtensor'),
-    ('xtensor-python', '0.26.1',
-     'https://github.com/xtensor-stack/xtensor-python'),
-    ('evalhyd', 'dev',
-     'https://gitlab.irstea.fr/HYCAR-Hydro/evalhyd/evalhyd')
-]
+deps = ['xtl', 'xtensor', 'xtensor-python', 'evalhyd']
+deps_blank_path = os.path.join(os.getcwd(), 'deps', '{}', 'include')
 
 deps_include_dirs = []
-for dep, version, url in deps:
+for dep in deps:
     if not os.getenv(f"EVALHYD_PYTHON_VENDOR_{dep.upper().replace('-', '_')}") == 'FALSE':
-        # remove existing dependency if it exists
-        dir_path = os.path.join(os.getcwd(), 'deps', dep)
-        if os.path.exists(dir_path) and os.path.isdir(dir_path):
-            shutil.rmtree(dir_path, onerror=remove_readonly)
-            print(f"removed existing {dep}")
-
-        # fetch dependency
-        git_clone(url, f'deps/{dep}', '--branch', version)
-        print(f"vendored {dep} {version}")
-
         # register dependency headers
-        deps_include_dirs.append(os.path.join(dir_path, 'include'))
-
+        deps_include_dirs.append(deps_blank_path.format(dep))
 
 # configure Python extension
 ext_modules = [