Picotool does not build against musl libc on linux

[dasimmet]

I have set up a build of picotool using the zig toolchain here

when linking picotool hermetically against musl libc, it failed because musl does not have a sys/cdefs.h

/home/dasimmet/repos/zig/raspi-pico-sdk/src/host/pico_platform/include/pico/platform.h:16:10: error: 'sys/cdefs.h' file not found
#include <sys/cdefs.h>
         ^~~~~~~~~~~~~~
/home/dasimmet/.cache/zig/p/122071e1ba857e67739c7e737c413e5d2e3ccb13cb9bdc28a1adc682d8c80e7d8178/bintool/bintool.cpp:10:10: note: in file included from /home/dasimmet/.cache/zig/p/122071e1ba857e67739c7e737c413e5d2e3ccb13cb9bdc28a1adc682d8c80e7d8178/bintool/bintool.cpp:10:
#include "boot/picobin.h"
         ^
/home/dasimmet/repos/zig/raspi-pico-sdk/src/common/boot_picobin_headers/include/boot/picobin.h:11:10: note: in file included from /home/dasimmet/repos/zig/raspi-pico-sdk/src/common/boot_picobin_headers/include/boot/picobin.h:11:
#include "pico/platform.h"

without it, it builds fine. according to musl, this is an internal glibc header that should not be included directly:
https://wiki.musl-libc.org/faq#Q:-When-compiling-something-against-musl,-I-get-error-messages-about-%3Ccode%3Esys/cdefs.h%3C/code%3E

[lurch]

Oh! Looks like this was fixed by raspberrypi/pico-sdk#2029