Revert "Only build libmbedcrypto"

This reverts commit 8298d70beecb6c3c1a375954e03f4ed1a80efc0a.

Conflicts:
* library/Makefile: removal of SOEXT_X509 and SOEXT_TLS vs change of
  value of SOEXT_CRYPTO. Keep all, with the new value of SOEXT_CRYPTO.
diff --git a/tests/Makefile b/tests/Makefile
index f7505b6..8fb187e 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -19,9 +19,9 @@
 LOCAL_CFLAGS += -D_POSIX_C_SOURCE=200809L
 
 ifndef SHARED
-DEP=../library/libmbedcrypto.a
+DEP=../library/libmbedcrypto.a ../library/libmbedx509.a ../library/libmbedtls.a
 else
-DEP=../library/libmbedcrypto.$(DLEXT)
+DEP=../library/libmbedcrypto.$(DLEXT) ../library/libmbedx509.$(DLEXT) ../library/libmbedtls.$(DLEXT)
 endif
 
 ifdef DEBUG