build: touch binaries after compile to stop perpetual rebuilds

build.sh

@@ -33,6 +33,13 @@ if stale build/kick kick.c meson.build subprojects wlr-protocols \
     set -x
     meson setup build --reconfigure
     meson compile -C build
+    # A successful build means the binaries now reflect every tracked
+    # source, even ones meson decided not to relink (e.g. wltest after
+    # only meson.build changed).  Touch them so the mtime-based stale()
+    # fast-path doesn't keep flagging them forever.  Ninja tracks
+    # incrementality via its own dep files, not the binary's mtime, so this
+    # never fools the next real rebuild.
+    touch build/kick build/wltest
     echo "Built: ./build/kick"
 else
     echo "build: nothing to do (binaries up to date)"