spice: set COMPATIBLE_HOST

Set COMPATIBLE_HOST to restrict building only for x86 archs.

The configure script clearly requires x86 archs. Message is as below.

Only x86 and x86-64 are supported

---
 recipes-support/spice/spice_git.bb | 2 ++
 1 file changed, 2 insertions(+)

index 6f1be3a..e62f315 100644
@@ -70,3 +70,5 @@ do_install_append() {
 	oe_runmake DESTDIR="${D}" install
 	cd -
 }
+
+COMPATIBLE_HOST = '(x86_64|i.86).*-linux'

2.11.0