LAKITU: Set EGIT_MASTER=main for more llvm packages

My previous commit missed some LLVM packages. We need to fix these too.

BUG=b/178727618
TEST=emerge-lakitu llvm-libunwind, emerge-lakitu compiler-rt
RELEASE_NOTE=None

cos-patch: bug
Change-Id: I00ebe101a65376b8bb4326804d0b41c907e58ed9
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/chromiumos-overlay/+/11591
Tested-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Main-Branch-Verified: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-by: Anil Altinay <aaltinay@google.com>
diff --git a/chromeos/config/env/sys-libs/compiler-rt b/chromeos/config/env/sys-libs/compiler-rt
new file mode 100644
index 0000000..216c46b
--- /dev/null
+++ b/chromeos/config/env/sys-libs/compiler-rt
@@ -0,0 +1,5 @@
+# Copyright 2021 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+EGIT_MASTER="main"
diff --git a/chromeos/config/env/sys-libs/llvm-libunwind b/chromeos/config/env/sys-libs/llvm-libunwind
new file mode 100644
index 0000000..216c46b
--- /dev/null
+++ b/chromeos/config/env/sys-libs/llvm-libunwind
@@ -0,0 +1,5 @@
+# Copyright 2021 The Chromium OS Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+EGIT_MASTER="main"