Revert "gnutls: disable libtasn build for darwin"

This reverts commit 8a1c2b65.
libtasn1 build fixed in https://review.jami.net/c/ring-daemon/+/17429

Change-Id: I6bf7becb34402cea5f8351bf813a0cd74b7a79f8

contrib/src/gnutls/rules.mak

@@ -42,6 +42,7 @@ GNUTLS_CONF := \
 	--disable-cxx \
 	--disable-srp-authentication \
 	--disable-psk-authentication-FIXME \
+	--with-included-libtasn1 \
 	--with-included-unistring \
 	--disable-openpgp-authentication \
 	--disable-openssl-compatibility \
@@ -52,10 +53,6 @@ GNUTLS_CONF := \
 	--without-idn \
 	$(HOSTCONF)
 
-ifndef HAVE_DARWIN_OS
-	GNUTLS_CONF += --with-included-libtasn1
-endif
-
 ifdef HAVE_IOS
 	GNUTLS_CONF += --disable-hardware-acceleration
 endif