make: Add comment about BUILD vs HOST
BRANCH=none
TEST=none
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
#
-# Toolchain configuration build system
-#
-
# Toolchain configuration
+#
+# BUILD - Refers to the system doing the "build".
+# For example, you would compile servo_ectool to run on your local
+# build machine.
+# HOST - Refers to target platform on top of the EC.
+# For example, you would compile ectool to run on the Chrome OS device.
min_make_version:=3.82
make_version_ok:=$(filter $(min_make_version), \
