etnaviv: native fence fd support

This adds native fence fd support to etnaviv, similarly to commit
0b98e84e9ba0 ("freedreno: native fence fd"), enabled for kernel
driver version 1.1 or later.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-By: Wladimir J. van der Laan <laanwj@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/configure.ac b/configure.ac
index 957991c..ef19733 100644
--- a/configure.ac
+++ b/configure.ac
@@ -80,7 +80,7 @@
 LIBDRM_NOUVEAU_REQUIRED=2.4.66
 LIBDRM_FREEDRENO_REQUIRED=2.4.74
 LIBDRM_VC4_REQUIRED=2.4.69
-LIBDRM_ETNAVIV_REQUIRED=2.4.74
+LIBDRM_ETNAVIV_REQUIRED=2.4.80
 
 dnl Versions for external dependencies
 DRI2PROTO_REQUIRED=2.8