[PATCH] mbedtls: Update to version 2.16.7

[DENG Qingfang]

Hi,

> +PKG_SOURCE:=v$(PKG_VERSION).tar.gz

This will end up with a file named "v2.16.7.tar.gz" in dl folder, which could be confusing.

> +PKG_SOURCE_URL:=https://github.com/ARMmbed/mbedtls/archive/
> +PKG_HASH:=c95b11557ee97d2bdfd48cd57cf9b648a6cddd2ca879e3c35c4e7525f2871992

You can use the following instead:

PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
PKG_SOURCE_URL:=https://codeload.github.com/ARMmbed/mbedtls/tar.gz/v$(PKG_VERSION)?

Regards,
Qingfang