paste: new applet

function                                             old     new   delta
paste_main                                             -     493    +493
packed_usage                                       31019   31070     +51
applet_names                                        2569    2575      +6
applet_main                                         1484    1488      +4
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 3/0 up/down: 554/0)             Total: 554 bytes

Signed-off-by: Maxime Coste <mawww@kakoune.org>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/paste/paste-pairs b/testsuite/paste/paste-pairs
new file mode 100644
index 0000000..90725fa
--- /dev/null
+++ b/testsuite/paste/paste-pairs
@@ -0,0 +1,16 @@
+cat > foo <<EOF
+foo1
+bar1
+foo2
+bar2
+foo3
+EOF
+
+cat > bar <<EOF
+foo1	bar1
+foo2	bar2
+foo3
+EOF
+
+busybox paste -s -d "\t\n" foo > baz
+cmp bar baz