drm: implement syncobj and fence for VIRGL/VirtIO driver

Extract protocol-agnostic FenceTimeline from Intel to shared
src/drivers/fence.rs — atomic-based fence tracking suitable
for Intel, VIRGL, and AMD drivers.

Extract protocol-agnostic SyncobjManager from Intel to shared
src/drivers/syncobj.rs — syncobj create/destroy/signal/reset/
wait/query and sync_file fd export/import.

Wire both into VirtioDriver:
- Add FenceTimeline + SyncobjManager fields
- Implement all 5 GpuDriver syncobj trait methods
  (create, destroy, wait, export_fd, import_fd)
- Track fence seqnos in virgl_submit_3d (allocate
  before submit, signal after completion)

Intel fence.rs and syncobj.rs converted to thin re-export
modules pointing at shared sources — no behavioral change
for Intel driver.

This gives Mesa VIRGL userspace the standard DRM syncobj
API for GPU/compositor synchronization.

recipes/tools/nano/source/syntax/java.nanorc

@@ -0,0 +1,16 @@
+## Syntax highlighting for Java.
+
+syntax java "\.java$"
+magic "Java "
+comment "//"
+
+color green "\<(boolean|byte|char|double|float|int|long|new|short|this|transient|void)\>"
+color red "\<(break|case|catch|continue|default|do|else|finally|for|if|return|switch|throw|try|while)\>"
+color cyan "\<(abstract|class|extends|final|implements|import|instanceof|interface|native)\>"
+color cyan "\<(package|private|protected|public|static|strictfp|super|synchronized|throws|volatile)\>"
+color red ""[^"]*""
+color yellow "\<(true|false|null)\>"
+color blue "//.*"
+color blue start="/\*" end="\*/"
+color brightblue start="/\*\*" end="\*/"
+color ,green "[[:space:]]+$"