config: enable shadow passwords unconditionally

Configurations without shadow passwords have been broken since the removal
of telnet: as the default entry in /etc/passwd is not empty (but rather
unset), there will be no way to log onto such a system by default. As
disabling shadow passwords is not useful anyways, remove this configuration
option.

The config symbol is kept (for a while), as packages from feeds depend on
it.

Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>

config/Config-build.in

@@ -47,10 +47,7 @@ menu "Global build settings"
 
 	config SHADOW_PASSWORDS
 		bool
-		prompt "Enable shadow password support"
 		default y
-		help
-		  Enable shadow password support.
 
 	config CLEAN_IPKG
 		bool

package/network/services/dropbear/Makefile

@@ -66,7 +66,6 @@ CONFIGURE_ARGS += \
 	--disable-pam \
 	--enable-openpty \
 	--enable-syslog \
-	$(if $(CONFIG_SHADOW_PASSWORDS),,--disable-shadow) \
 	--disable-lastlog \
 	--disable-utmpx \
 	$(if $(CONFIG_DROPBEAR_UTMP),,--disable-utmp) \

toolchain/uClibc/common.mk

@@ -77,7 +77,6 @@ define Host/Configure
 	$(SED) 's,^KERNEL_HEADERS=.*,KERNEL_HEADERS=\"$(BUILD_DIR_TOOLCHAIN)/linux-dev/include\",g' \
 		-e 's,^.*UCLIBC_HAS_FPU.*,UCLIBC_HAS_FPU=$(if $(CONFIG_SOFT_FLOAT),n,y),g' \
 		-e 's,^.*UCLIBC_HAS_SOFT_FLOAT.*,UCLIBC_HAS_SOFT_FLOAT=$(if $(CONFIG_SOFT_FLOAT),y,n),g' \
-		-e 's,^.*UCLIBC_HAS_SHADOW.*,UCLIBC_HAS_SHADOW=$(if $(CONFIG_SHADOW_PASSWORDS),y,n),g' \
 		-e 's,^.*UCLIBC_HAS_LOCALE.*,UCLIBC_HAS_LOCALE=$(if $(CONFIG_BUILD_NLS),y,n),g' \
 		-e 's,^.*UCLIBC_BUILD_ALL_LOCALE.*,UCLIBC_BUILD_ALL_LOCALE=$(if $(CONFIG_BUILD_NLS),y,n),g' \
 		-e 's,^.*UCLIBC_HAS_SSP[^_].*,UCLIBC_HAS_SSP=$(if $(or $(CONFIG_PKG_CC_STACKPROTECTOR_REGULAR),$(CONFIG_PKG_CC_STACKPROTECTOR_STRONG)),y,n),g' \