Please add embedded libc's (Newlib & picolibc) support

[abrodkin]

Newlib and its close derivative picolibc are de-facto standard C libraries used in embedded world, and given they both are beings actively developed it might be good to have them added to the beautiful service of Elixir.

Some more detailed info on both projects:

• Newlib
  • Homepage: https://sourceware.org/newlib/
  • Sources: https://sourceware.org/git/?p=newlib-cygwin.git;a=summary
• Picolibc
  • Home page: https://keithp.com/picolibc/
  • Sources: https://github.com/picolibc/picolibc