- fix false test failure on picolibc
- For picolibc, the result of mallinfo().uordblks doesn't go back
to zero after the first allocation. By adding `free(malloc(4))`
before recording the pre-test mallinfo() value, this issues is
worked arround
- increase test coverage to also cover realloc()
- ease testing with picolibc by allowing `make PICOLIBC=1 flash test`
Add ATmega328P Xplained Mini board. The board is an official
development kit from MCHP based on the Arduino UNO, reduced
hardware, with a xplainedmini debugger and CDC ACM serial
converter.
Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>
