testing: Disable deprecated features in Botan

We keep MD5 enabled for now as we need it for TLS 1.0/1.1.  Once we
remove that we can reconsider (although, it's also needed for EAP-MD5
and since MD4 is disabled as well, which means EAP-MSCHAPv2 won't
be available, we'd be left with only EAP-GTC for simple username/password
authentication, which nobody else supports).

testing/scripts/recipes/011_botan.mk

@@ -7,10 +7,13 @@ REV = 3.7.1
 NUM_CPUS := $(shell getconf _NPROCESSORS_ONLN)
 
 # the first two are necessary due to LD, the others to reduce the build time
+# the last one enables MD5, which we need for TLS 1.0/1.1 (and possibly EAP-MD5)
 CONFIG_OPTS = \
 	--without-os-features=threads \
 	--disable-modules=locking_allocator \
-	--disable-modules=pkcs11,tls,x509,xmss
+	--disable-modules=pkcs11,tls,x509,xmss \
+	--disable-deprecated-features \
+	--enable-modules=md5
 
 all: install