squisher: link the target $OUTFILE.

Change-Id: I5d905fb12e7d5f5cbae0af85f229b29becaf33ef
diff --git a/tools/squisher b/tools/squisher
index 3c0b600..70fedda 100755
--- a/tools/squisher
+++ b/tools/squisher
@@ -35,8 +35,7 @@
 echo -e $CL_CYN"MODVERSION: $MODVERSION"$CL_RST
 OUTFILE=$OUT/cm-$MODVERSION.zip
 
-cp $OTAPACKAGE $OUTFILE.tmp
-mv $OUTFILE.tmp $OUTFILE
+ln $OTAPACKAGE $OUTFILE
 
 # Create a md5 checksum image of the repacked package
 (