Remove redundant assignment

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 8fd959c..3e0a5f2 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -154,7 +154,6 @@
     set(mbedtls_static_target "mbedtls_static")
     set(mbedx509_static_target "mbedx509_static")
     set(mbedcrypto_static_target "mbedcrypto_static")
-    set(target_libraries "mbedcrypto" "mbedx509" "mbedtls")
     list(APPEND target_libraries
         "mbedcrypto_static" "mbedx509_static" "mbedtls_static")
 elseif(USE_STATIC_MBEDTLS_LIBRARY)