tools: -Wno-deprecated-declarations for OpenSSL on darwin

Since OpenSSL is deprecated on OS X in favour of Common Crypto API disable the
warning for this host OS.

Another solution would be to add some glue layer for crypto stuff, but I think
this is not worth the effort.

Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

tools/Makefile

@@ -129,6 +129,14 @@ endif
 ifneq ($(CONFIG_MX23)$(CONFIG_MX28)$(CONFIG_FIT_SIGNATURE),)
 HOSTLOADLIBES_mkimage += \
 	$(shell pkg-config --libs libssl libcrypto 2> /dev/null || echo "-lssl -lcrypto")
+
+# OS X deprecate openssl in favour of CommonCrypto, supress deprecation
+# warnings on those systems
+ifeq ($(HOSTOS),darwin)
+HOSTCFLAGS_mxsimage.o += -Wno-deprecated-declarations
+HOSTCFLAGS_image-sig.o += -Wno-deprecated-declarations
+HOSTCFLAGS_rsa-sign.o += -Wno-deprecated-declarations
+endif
 endif
 
 HOSTLOADLIBES_dumpimage := $(HOSTLOADLIBES_mkimage)