Recursive Dependency Detected on replacing select LIBNEWLIBC with select LIBMUSL

[ThestralWarrior]

Yang Hu's PR #12 makes a change to Config.uk to upgrade Mimalloc to use Musl instead of Newlib which hasn't been updated since 2021/22.

When I applied the PR locally and used Mimalloc for running Nginx from https://github.com/unikraft/catalog-core, it ended up giving a recursive dependency error, so no make commands were able to run.

unikraft@wasp:~/nginx/nginx-pan-2$ make menuconfig
make[1]: Entering directory '/home/unikraft/nginx/nginx-pan-2/workdir/unikraft'
  LN      Makefile
  MKDIR   lxdialog
  MAKE    kconfig
  UPD     /home/unikraft/nginx/nginx-pan-2/workdir/build/kconfig/mconf-cfg
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/plat/xen/Config.uk:1:error: recursive dependency detected!
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/plat/xen/Config.uk:1: symbol PLAT_XEN depends on HAVE_SYSCALL
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/Config.uk:23:     symbol HAVE_SYSCALL is selected by LIBSYSCALL_SHIM_HANDLER
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/syscall_shim/Config.uk:28:        symbol LIBSYSCALL_SHIM_HANDLER depends on LIBSYSCALL_SHIM
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/syscall_shim/Config.uk:1: symbol LIBSYSCALL_SHIM is selected by LIBUKCPIO
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/ukcpio/Config.uk:1:       symbol LIBUKCPIO depends on LIBVFSCORE
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/vfscore/Config.uk:1:      symbol LIBVFSCORE is selected by LIBMUSL
/home/unikraft/nginx/nginx-pan-2/workdir/libs/lib-musl/Config.uk:2:     symbol LIBMUSL is selected by LIBMIMALLOC
/home/unikraft/nginx/nginx-pan-2/workdir/libs/lib-mimalloc/Config.uk:7: symbol LIBMIMALLOC is selected by LIBUKBOOT_INITMIMALLOC
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/ukboot/Config.uk:113:     symbol LIBUKBOOT_INITMIMALLOC is part of choice <choice>
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/ukboot/Config.uk:98:      choice <choice> contains symbol <choice>
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/ukboot/Config.uk:98:      choice <choice> contains symbol LIBUKBOOT
/home/unikraft/nginx/nginx-pan-2/workdir/unikraft/lib/ukboot/Config.uk:1:       symbol LIBUKBOOT is selected by PLAT_XEN
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"

make[3]:  [/home/unikraft/nginx/nginx-pan-2/workdir/build/Makefile:1018: menuconfig] Error 1
make[2]:  [Makefile:1175: sub-make] Error 2
make[1]:  [Makefile:41: _all] Error 2
make[1]: Leaving directory '/home/unikraft/nginx/nginx-pan-2/workdir/unikraft'
make:  [Makefile:13: menuconfig] Error 2

Replacing select LIBMUSL with depends on LIBMUSL appears to resolve the recursive dependency error for now.