make: Add comment about libcryptoc
BRANCH=none
TEST=none
Tested-by: Craig Hesling
#
# Build and link against libcryptoc.
+# See https://chromium.googlesource.com/chromiumos/third_party/cryptoc .
ifeq ($(CONFIG_LIBCRYPTOC),y)
+# The cryptoc path can be overridden on invocation, as in the following example:
+# $ make CRYPTOC_DIR=~/src/cryptoc BOARD=bloonchipper
CRYPTOC_DIR ?= $(realpath ../../third_party/cryptoc)
# SUPPORT_UNALIGNED indicates to libcryptoc that provided data buffers
