programs, tests: Depend only on libmbedcrypto
Update the tests and programs to depend only on libmbedcrypto, since
we'll soon only build libmbedcrypto.
diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 65ac9b0..98f322d 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -14,6 +14,12 @@
OPENSSL ?= openssl
FAKETIME ?= faketime
+# Tools from Mbed TLS
+# Mbed Crypto depends on Mbed TLS programs to generate its test certificates.
+# These programs can be installed from Mbed TLS.
+MBEDTLS_CERT_WRITE ?= mbedtls_cert_write
+MBEDTLS_CERT_REQ ?= mbedtls_cert_req
+
## Build the generated test data. Note that since the final outputs
## are committed to the repository, this target should do nothing on a