Contribution description

This adds the new printf_long_long module that can be used to enable printing of long long and unsigned long long.

This has been implemented for mpaland-printf. In addition, this module is a default module for 32-bit and 64-bit systems if mpaland-printf is used, 64 bit support is not too expensive for them. (And on 64-bit systems support for long long is needed for support of %p, which is pretty basic.)

This is mainly useful for MSP430, where otherwise mpaland-printf would require more memory than newlib's implementation.

Testing procedure

Now on MSP430, adding USEPKG += mpaland-printf should reduce memory requirements instead of increasing them, at the cost of not supporting 64 bit numbers. (But that is also the case without it, so this is fair game.)

Users who want 64 bit support on MSP430 can now use mpaland-printf and printf_long_long, which would come for some memory cost.

On 64 bit and 32 bit systems, mpaland-printf adds printf_long_long to the default modules. In other words: 64 bit printing is opt-out when it is cheap, and opt-in when it is costly.

Issues/PRs references

None