Merge bitcoin#795: Avoid linking libcrypto in the valgrind ct test.

57d3a3c Avoid linking libcrypto in the valgrind ct test. (Gregory Maxwell)

Pull request description:

  Libcrypto isn't useful here and on some systems UB in OpenSSL's
   init causes failures.

  Fixes bitcoin#775.

ACKs for top commit:
  real-or-random:
    ACK 57d3a3c
  elichai:
    tACK 57d3a3c

Tree-SHA512: 0b10b3e9cc0871a9a93271c72be9d1663ea163745071cb4951a99664c048ab5b6f46bb7cff36e7000e8fb26df7ee164f536f61210bece376478f9f774f34e83d

Makefile.am

@@ -99,7 +99,7 @@ if VALGRIND_ENABLED
 tests_CPPFLAGS += -DVALGRIND
 noinst_PROGRAMS += valgrind_ctime_test
 valgrind_ctime_test_SOURCES = src/valgrind_ctime_test.c
-valgrind_ctime_test_LDADD = libsecp256k1.la $(SECP_LIBS) $(SECP_TEST_LIBS) $(COMMON_LIB)
+valgrind_ctime_test_LDADD = libsecp256k1.la $(SECP_LIBS) $(SECP_LIBS) $(COMMON_LIB)
 endif
 if !ENABLE_COVERAGE
 tests_CPPFLAGS += -DVERIFY