Add symlink for uniq(1).

Test: clean build
Change-Id: Ibafa1fcb4a008bebfeee1417e249a9ba04249bcf
diff --git a/toybox/linux-x86/uniq b/toybox/linux-x86/uniq
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/uniq
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file