Enable test generation from bignum_mod.py

Signed-off-by: Werner Lewis <werner.lewis@arm.com>
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index ae3d054..71dd70b 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -71,6 +71,7 @@
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/bignum_common.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/bignum_core.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/bignum_mod_raw.py
+            ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/bignum_mod.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/test_case.py
             ${CMAKE_CURRENT_SOURCE_DIR}/../scripts/mbedtls_dev/test_data_generation.py
     )