imap-send: link against libcrypto for HMAC and others

When using stricter linkers, such as GNU gold or Darwin ld, transitive
dependencies are not counted towards symbol resolution. If we don't link
imap-send to libcrypto, we'll have undefined references to the HMAC_*,
EVP_* and ERR_* functions families.

Signed-off-by: Diego Elio Pettenò <flameeyes@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Makefile

@@ -1921,7 +1921,7 @@ git-%$X: %.o $(GITLIBS)
 
 git-imap-send$X: imap-send.o $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
-		$(LIBS) $(OPENSSL_LINK) $(OPENSSL_LIBSSL)
+		$(LIBS) $(OPENSSL_LINK) $(OPENSSL_LIBSSL) $(LIB_4_CRYPTO)
 
 git-http-fetch$X: revision.o http.o http-walker.o http-fetch.o $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \