CONFIG_SHELL_HELP=n fails to compile

[holgerschurig]

Describe the bug
A clear and concise description of what the bug is.
What have you tried to diagnose or workaround this issue?

To Reproduce

1. cat prj.conf

CONFIG_LOG=y
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_BACKEND_NATIVE_POSIX=y
CONFIG_SHELL=y
CONFIG_SHELL_WILDCARD=n
CONFIG_SHELL_VT100_COLORS=n
CONFIG_SHELL_METAKEYS=n
CONFIG_SHELL_HELP=n
CONFIG_SHELL_STATS=n
CONFIG_SHELL_CMDS_RESIZE=n
CONFIG_SHELL_HISTORY=n

2. create an "empty" main.c (just with a main() definition)
3. west build --pristine -b native_posix
4. See error:

[98/98] Linking C executable zephyr/zephyr.elf
FAILED: zephyr/zephyr.elf zephyr/zephyr.lst zephyr/zephyr.stat zephyr/zephyr.exe 
: && ccache /usr/bin/gcc    zephyr/CMakeFiles/zephyr_prebuilt.dir/misc/empty_file.c.obj  -o zephyr/zephyr.elf  -Wl,-T zephyr/linker.cmd -Wl,-Map=/home/schurig/d/v73/build/zephyr/zephyr_prebuilt.map -Wl,--whole-archive app/libapp.a zephyr/libzephyr.a zephyr/arch/arch/posix/core/libarch__posix__core.a zephyr/soc/posix/inf_clock/libsoc__posix__inf_clock.a zephyr/boards/posix/native_posix/libboards__posix__native_posix.a zephyr/drivers/serial/libdrivers__serial.a -Wl,--no-whole-archive zephyr/kernel/libkernel.a zephyr/CMakeFiles/offsets.dir/arch/posix/core/offsets/offsets.c.obj -L/home/schurig/d/v73/build/zephyr -Wl,--gc-sections -Wl,--build-id=none -Wl,--sort-common=descending -Wl,--sort-section=alignment -Wl,-u,_OffsetAbsSyms -Wl,-u,_ConfigAbsSyms -m32 -lasan -fsanitize=address -ldl -pthread -lm && cd /home/schurig/d/v73/build/zephyr && /usr/bin/cmake -E rename zephyr_prebuilt.map zephyr.map && /usr/bin/objdump -d -S zephyr.elf >zephyr.lst && /usr/bin/readelf -e zephyr.elf > zephyr.stat && /usr/bin/cmake -E copy zephyr.elf zephyr.exe
/usr/bin/ld: zephyr/libzephyr.a(shell_cmds.c.obj): in function `cmd_help':
/home/schurig/d/v73/build/../zephyr/subsys/shell/shell_cmds.c:301: undefined reference to `shell_help_subcmd_print'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.
FATAL ERROR: command exited with status 1: /usr/bin/cmake --build /home/schurig/d/v73/build

Changing CONFIG_SHELL_HELP=n "fixes" the issue.

Logs and console output
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Environment (please complete the following information):

• OS: Linux
• Toolchain: native
• happend on git HEAD of today (git describe --tags: zephyr-v2.4.0-388-g5bda586c64)