Fix issue #2630 (#2631)

* Fix issue #2630

pythonforandroid/recipes/tflite-runtime/__init__.py

@@ -1,12 +1,11 @@
-from pythonforandroid.recipe import PythonRecipe, current_directory,\
+from pythonforandroid.recipe import PythonRecipe, current_directory, \
     shprint, info_main, warning
 from pythonforandroid.logger import error
 from os.path import join
 import sh
 
 
 class TFLiteRuntimeRecipe(PythonRecipe):
-
     ###############################################################
     #
     # tflite-runtime README:
@@ -31,6 +30,15 @@ class TFLiteRuntimeRecipe(PythonRecipe):
     site_packages_name = 'tflite-runtime'
     call_hostpython_via_targetpython = False
 
+    def should_build(self, arch):
+        name = self.folder_name.replace('-', '_')
+
+        if self.ctx.has_package(name, arch):
+            info_main('Python package already exists in site-packages')
+            return False
+        info_main('{} apparently isn\'t already in site-packages'.format(name))
+        return True
+
     def build_arch(self, arch):
         if arch.arch == 'x86_64':
             warning("******** tflite-runtime x86_64 will not be built *******")
@@ -54,9 +62,9 @@ def build_arch(self, arch):
         pybind11_include_dir = pybind11_recipe.get_include_dir(arch)
         numpy_include_dir = join(self.ctx.get_site_packages_dir(arch),
                                  'numpy', 'core', 'include')
-        includes = ' -I' + python_include_dir +\
-            ' -I' + numpy_include_dir +\
-            ' -I' + pybind11_include_dir
+        includes = ' -I' + python_include_dir + \
+                   ' -I' + numpy_include_dir + \
+                   ' -I' + pybind11_include_dir
 
         # Scripts
         build_script = join(script_dir, 'build_pip_package_with_cmake.sh')