Add toybox symlinks for true & uname

This new directory will be manually managed for now, so I'm not putting
it under the existing linux-x86 directory. It will be prepended to $PATH
during the build so that the build can start adopting toybox verssions
of tools instead of the version provided by the host.

Test: m
Change-Id: Ie880fabe7c8091d2984c260390133b0c482c1a59
diff --git a/toybox/linux-x86/true b/toybox/linux-x86/true
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/true
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file
diff --git a/toybox/linux-x86/uname b/toybox/linux-x86/uname
new file mode 120000
index 0000000..c6b4b1f
--- /dev/null
+++ b/toybox/linux-x86/uname
@@ -0,0 +1 @@
+../../linux-x86/bin/toybox
\ No newline at end of file