Add support for:
* mbedTLS as SSL choice
* zstd as compression option
* libgpiod to support microcontroller firmware update
* efibootmgr to support EFI Boot Guard
* libwebsockets and liburiparser to support SWU forwarder
Also:
* drop upstream patches
* drop CONFIG_GUNZIP. Setting it because Buxybox provides a binary named gunzip is wrong.
CONFIG_GUNZIP should only be set if zlib is provided, which Buxybox'
gunzip does not.
Regenerated the .config file by doing:
```
make swupdate-menuconfig
make swupdate-update-config
```
.. and removing the paths for the build options manually.
Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
1b7dfa7869