busybox: remove shadow passwords config tweaks

These configuration tweaks were added for compatibility with Blackfin
toolchains that bundled a uClibc version without shadow passwords
support. Blackfin is gone, so this is no longer needed.

Cc: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/busybox/busybox.mk

@@ -148,14 +148,6 @@ define BUSYBOX_PREFER_STATIC
 endef
 endif
 
-# Disable shadow passwords support if unsupported by the C library
-ifeq ($(BR2_TOOLCHAIN_HAS_SHADOW_PASSWORDS),)
-define BUSYBOX_INTERNAL_SHADOW_PASSWORDS
-	$(call KCONFIG_ENABLE_OPT,CONFIG_USE_BB_PWD_GRP,$(BUSYBOX_BUILD_CONFIG))
-	$(call KCONFIG_ENABLE_OPT,CONFIG_USE_BB_SHADOW,$(BUSYBOX_BUILD_CONFIG))
-endef
-endif
-
 define BUSYBOX_INSTALL_UDHCPC_SCRIPT
 	if grep -q CONFIG_UDHCPC=y $(@D)/.config; then \
 		$(INSTALL) -m 0755 -D package/busybox/udhcpc.script \
@@ -273,7 +265,6 @@ define BUSYBOX_KCONFIG_FIXUP_CMDS
 	$(BUSYBOX_SET_MDEV)
 	$(BUSYBOX_SET_CRYPT_SHA)
 	$(BUSYBOX_LINUX_PAM)
-	$(BUSYBOX_INTERNAL_SHADOW_PASSWORDS)
 	$(BUSYBOX_SET_INIT)
 	$(BUSYBOX_SET_WATCHDOG)
 	$(BUSYBOX_SET_SELINUX)