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/programs/aes/CMakeLists.txt b/programs/aes/CMakeLists.txt
index f5a0caa..6c4c7e1 100644
--- a/programs/aes/CMakeLists.txt
+++ b/programs/aes/CMakeLists.txt
@@ -1,8 +1,8 @@
 add_executable(aescrypt2 aescrypt2.c)
-target_link_libraries(aescrypt2 mbedtls)
+target_link_libraries(aescrypt2 mbedcrypto)
 
 add_executable(crypt_and_hash crypt_and_hash.c)
-target_link_libraries(crypt_and_hash mbedtls)
+target_link_libraries(crypt_and_hash mbedcrypto)
 
 install(TARGETS aescrypt2 crypt_and_hash
         DESTINATION "bin"