package/tcpdump: ease the use of chroot

Having this chroot feature enabled is not funny when no user to setuid
to is defined. This patch fixes this annoyance by setting the default
chroot user to "nobody", which exists as long as base-files do.

package/tcpdump/Makefile

@@ -5,7 +5,7 @@ include ${TOPDIR}/rules.mk
 
 PKG_NAME:=		tcpdump
 PKG_VERSION:=		4.1.1
-PKG_RELEASE:=		1
+PKG_RELEASE:=		2
 PKG_MD5SUM:=		d0dd58bbd6cd36795e05c6f1f74420b0
 PKG_DESCR:=		A tool for network monitoring and data acquisition
 PKG_SECTION:=		net
@@ -32,7 +32,7 @@ else
 CONFIGURE_ARGS+=	--disable-ipv6
 endif
 ifneq (${ADK_PACKAGE_TCPDUMP_WITH_CHROOT},)
-CONFIGURE_ARGS+=	--with-chroot="/var/lib/tcpdump"
+CONFIGURE_ARGS+=	--with-chroot="/var/lib/tcpdump" --with-user="nobody"
 endif
 XAKE_FLAGS+=		CCOPT="${TARGET_CFLAGS}" \
 			INCLS="-I. -I${STAGING_TARGET_DIR}/usr/include"