Update __init__.py

Bump version,  change depends to hostpython_prerequisites.
Fix kivy#3122

Author: RobertFlatt

pythonforandroid/recipes/kiwisolver/__init__.py

@@ -3,17 +3,17 @@
 
 class KiwiSolverRecipe(PyProjectRecipe):
     site_packages_name = 'kiwisolver'
-    version = '1.4.5'
+    version = '1.4.8'
     url = 'git+https://github.com/nucleic/kiwi'
-    depends = ['cppy']
+    hostpython_prerequisites = ['cppy']
     need_stl_shared = True
 
     # from https://github.com/kivy/python-for-android/issues/3115
     def get_recipe_env(self, arch, **kwargs):
         env = super().get_recipe_env(arch, **kwargs)
         flags = " -I" + self.ctx.python_recipe.include_root(arch.arch)
-        env["CFLAGS"] = flags
-        env["CPPFLAGS"] = flags
+        env["CFLAGS"] += flags
+        env["CPPFLAGS"] += flags
         return env