RP2040 : Enabling hashlib.sha1 during compilation

[ABelliqueux]

So for those of you wondering how to get sha1 back in (u)hashlib on the rp2 port, it can be enabled by defining
MICROPY_PY_UHASHLIB_SHA1 in 'ports/rp2/mpconfigport.h', after the #include directives (l.36) , i.e :

[...]
#include "pico/multicore.h"
#include "mpconfigboard.h"

#define MICROPY_PY_UHASHLIB_SHA1 (1)
// alternatively, use
//  #define MICROPY_PY_NETWORK          (1)  
// for a full network stack ( adds ~145KB to firmware file size )

// Board and hardware specific configuration
[...]

The resulting filesize with only SHA1 enabled is ~10KB more.

As I didn't find any ressources mentioning this, I figured I might as well save someone else the few hours lost figuring this one out.

Of course, don't use SHA1 for new stuff as it's deprecated, etc.