Add libgeos headers to path

def get_recipe_env(self, arch, with_flags_in_cc=True):
        """ Add libgeos headers to path """
        env = super(ShapelyRecipe, self).get_recipe_env(arch, with_flags_in_cc)
        libgeos_dir = Recipe.get_recipe('libgeos', self.ctx).get_build_dir(arch.arch)
        env['CFLAGS'] += " -I{}/dist/include".format(libgeos_dir)
        return env