gnutls: fix android build on x86 platforms

This patch fixes a link issue with GnuTLS when building for x86.

Tuleap: #102
Change-Id: Ic46824d95cbf568fedd2a6601a9359acc2672e83

contrib/src/gnutls/rules.mak

@@ -46,9 +46,14 @@ GNUTLS_CONF := \
 	--disable-openssl-compatibility \
 	--disable-guile \
 	--disable-nls \
+	--disable-dtls-srtp-support \
 	--without-libintl-prefix \
 	$(HOSTCONF)
 
+ifdef HAVE_ANDROID
+	GNUTLS_CONF += --disable-hardware-acceleration
+endif
+
 DEPS_gnutls = nettle $(DEPS_nettle) iconv $(DEPS_iconv)