Add symlinks to current rustfmt

A fixed path is required when referencing the prebuilt rustfmt in
preupload hook. Create symlinks for the rustfmt binaries from the
current release (1.43.0).

Test: lunch aosp_arm64-eng && m
Bug: 157146658
Change-Id: I89a39f053a0315c6ce2456b73a8ad3e6387a45cc
diff --git a/darwin-x86/stable/rustfmt b/darwin-x86/stable/rustfmt
new file mode 120000
index 0000000..e30d30f
--- /dev/null
+++ b/darwin-x86/stable/rustfmt
@@ -0,0 +1 @@
+../1.43.0/bin/rustfmt
\ No newline at end of file
diff --git a/linux-x86/stable/rustfmt b/linux-x86/stable/rustfmt
new file mode 120000
index 0000000..e30d30f
--- /dev/null
+++ b/linux-x86/stable/rustfmt
@@ -0,0 +1 @@
+../1.43.0/bin/rustfmt
\ No newline at end of file