Remove obsolete alias to //external:cc_toolchain.

RELNOTES: None.
PiperOrigin-RevId: 306383589
Change-Id: Id1c4cebefb444d7bd76624ef05a623eafd75808d
diff --git a/cc/private/toolchain/BUILD b/cc/private/toolchain/BUILD
index 70280af..3026ac6 100644
--- a/cc/private/toolchain/BUILD
+++ b/cc/private/toolchain/BUILD
@@ -65,19 +65,6 @@
     srcs = [],
 )
 
-# This is the entry point for --crosstool_top.  Toolchains are found
-# by lopping off the name of --crosstool_top and searching for
-# "cc-compiler-${CPU}" in this BUILD file, where CPU is the target CPU
-# specified in --cpu.
-#
-# This file group should include
-#   * all cc_toolchain targets supported
-#   * all file groups that said cc_toolchain might refer to
-alias(
-    name = "toolchain",
-    actual = "//external:cc_toolchain",
-)
-
 filegroup(
     name = "srcs",
     srcs = glob(["**"]),