Snippets for mspdebug 0.25 from Alpine riscv64

Sourced from https://build.alpinelinux.org/buildlogs/build-edge-riscv64/testing/mspdebug/mspdebug-0.25-r1.log.

• /usr/include/sys/signal.h:1:2: warning: #warning redirecting incorrect #include <sys/signal.h> to <signal.h> [-Wcpp]
      1 | #warning redirecting incorrect #include <sys/signal.h> to <signal.h>
        |  ^~~~~~~
  

• drivers/jtdev_bus_pirate.c:189:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    189 |     if(write(p->port, &out_buff, 1));
        |     ^~