unit-tests: Add test suite for Ed448

Same issue with signature malleability as with Ed25519 and apparently
OpenSSL doesn't even explicitly verify that the most significant 10 bits
are all zero.

Author: tobiasbrunner

src/libstrongswan/tests/Makefile.am

@@ -58,6 +58,7 @@ libstrongswan_tests_SOURCES = tests.h tests.c \
   suites/test_mgf1.c \
   suites/test_ntru.c \
   suites/test_ed25519.c \
+  suites/test_ed448.c \
   suites/test_signature_params.c
 
 libstrongswan_tests_CFLAGS = \