util-linux: add nsenter option

[Peter: adjust white space and commit message]
Signed-off-by: Shawn Landden <shawn@churchofgit.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/util-linux/Config.in

@@ -106,6 +106,11 @@ config BR2_PACKAGE_UTIL_LINUX_MOUNT
 	help
 	  Mount/unmount filesystems
 
+config BR2_PACKAGE_UTIL_LINUX_NSENTER
+	bool "nsenter"
+	help
+	  Enter namespaces (setns(2) frontend)
+
 config BR2_PACKAGE_UTIL_LINUX_PIVOT_ROOT
 	bool "pivot_root"
 	help

package/util-linux/util-linux.mk

@@ -62,6 +62,7 @@ UTIL_LINUX_CONF_OPT += \
 	$(if $(BR2_PACKAGE_UTIL_LINUX_LOGIN_UTILS),--enable-last --enable-login --enable-su --enable-sulogin,--disable-last --disable-login --disable-su --disable-sulogin) \
 	$(if $(BR2_PACKAGE_UTIL_LINUX_MESG),--enable-mesg,--disable-mesg) \
 	$(if $(BR2_PACKAGE_UTIL_LINUX_MOUNT),--enable-mount,--disable-mount) \
+	$(if $(BR2_PACKAGE_UTIL_LINUX_NSENTER),--enable-nsenter,--disable-nsenter) \
 	$(if $(BR2_PACKAGE_UTIL_LINUX_PARTX),,--disable-partx) \
 	$(if $(BR2_PACKAGE_UTIL_LINUX_PIVOT_ROOT),--enable-pivot_root,--disable-pivot_root) \
 	$(if $(BR2_PACKAGE_UTIL_LINUX_RAW),--enable-raw,--disable-raw) \