libunarchive: move dpkg-specific things into dpkg.c. 0 byte size differences

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

testsuite/tar.tests

@@ -8,16 +8,17 @@ mkdir tempdir && cd tempdir || exit 1
 
 # testing "test name" "script" "expected result" "file input" "stdin"
 
-testing "tar hardlinks and repeated files" \
-">input_hard1
+testing "tar hardlinks and repeated files" "\
+rm -rf input_* test.tar 2>/dev/null
+>input_hard1
 ln input_hard1 input_hard2
 mkdir input_dir
 >input_dir/file
 tar cf test.tar input input_dir/ input_hard1 input_hard2 input_hard1 input_dir/ input
 tar tvf test.tar | sed 's/.*[0-9] input/input/'
 tar xf test.tar 2>&1 && echo Ok
-" \
-"input
+" "\
+input
 input_dir/
 input_dir/file
 input_hard1