meson: convert disas directory to Meson

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/meson.build b/meson.build
index 06755f3..edb6353 100644
--- a/meson.build
+++ b/meson.build
@@ -673,6 +673,7 @@
 
 subdir('softmmu')
 subdir('backends')
+subdir('disas')
 subdir('migration')
 subdir('monitor')
 subdir('net')