shadow: fix find cmd in pre_build().

--HG--
extra : convert_revision : 6a17983df5c8ee4231ba7ec08c624b5d692b8f90

templates/shadow/template

@@ -25,9 +25,11 @@ Add_dependency full pam
 pre_build()
 {
 	# Don't install the groups cmd, we use the one from coreutils.
-	cd $wrksrc && \
-		sed -i 's/groups$(EXEEXT) //' src/Makefile && \
-		find man -name Makefile -exec sed -i 's/groups\.1 / /' {}
+	cd $wrksrc || return 1
+	sed -i 's/groups$(EXEEXT) //' src/Makefile
+	for f in $(find man -name Makefile); do
+		sed -i 's/groups\.1 / /' $f
+	done
 }
 
 post_install()