Add a freebsd-dri-amd64 config, and quiet makedepend slightly by making an
EXPAT_INCLUDES config variable (set on FreeBSD) which is then used in
Makefile.template's INCLUDES.
diff --git a/configs/freebsd-dri-amd64 b/configs/freebsd-dri-amd64
new file mode 100644
index 0000000..f578377
--- /dev/null
+++ b/configs/freebsd-dri-amd64
@@ -0,0 +1,8 @@
+# -*-makefile-*-
+# Configuration for freebsd-dri-amd64: FreeBSD DRI hardware drivers
+
+include $(TOP)/configs/freebsd-dri
+
+CONFIG_NAME = freebsd-dri-x86-64
+
+ASM_FLAGS = -DUSE_X86_64_ASM