Build the new bignum_new.c file

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index ed58a9e..19ba315 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -18,6 +18,7 @@
     asn1write.c
     base64.c
     bignum.c
+    bignum_new.c
     camellia.c
     ccm.c
     chacha20.c