Corrected incorrect DESTDIR variables in usher (should be TARGET)

Makefile

@@ -16,7 +16,7 @@ DESC = Base system directories and files
 ARCHIVE := 
 SRCDIR := $(PWD)/SRC/snap-base
 PATCHDIR := $(PWD)/SRC/patches
-VERSION := 0.0alpha1-2
+VERSION := 0.0alpha1-3
 
 include /usr/share/snap/Makefile.snaplinux
 

SNAP/usher

@@ -28,13 +28,13 @@ case $1 in
         ${TARGET}/etc/snap.conf
     fi
     if [ ! -f ${TARGET}/var/log/btmp ]; then
-      install -v -m 600 /dev/null $(DESTDIR)/var/log/btmp
+      install -v -m 600 /dev/null ${TARGET}/var/log/btmp
     fi
     if [ ! -f ${TARGET}/var/log/lastlog ]; then
-      install -v -m 664 /dev/null $(DESTDIR)/var/log/lastlog
+      install -v -m 664 /dev/null ${TARGET}/var/log/lastlog
     fi
     if [ ! -f ${TARGET}/var/log/wtmp ]; then
-      install -v -m 664 /dev/null $(DESTDIR)/var/log/wtmp
+      install -v -m 664 /dev/null ${TARGET}/var/log/wtmp
     fi
     ;;
   prerm)