qemu_multiarch_testing: update

* qemu_multiarch_testing/.gitignore: New file.
* qemu_multiarch_testing/README: Update statistics.
* qemu_multiarch_testing/hdc.dir/init2: Run "make check".
* qemu_multiarch_testing/make-hdc-img.sh: Robustify,
automatically calculate hdc image size.
* qemu_multiarch_testing/parallel-build-hdc-img.sh: Reduce
hdb image size.  Report completion of each parallelized task.
diff --git a/qemu_multiarch_testing/parallel-build-hdc-img.sh b/qemu_multiarch_testing/parallel-build-hdc-img.sh
index cbfe42f..d98f954 100755
--- a/qemu_multiarch_testing/parallel-build-hdc-img.sh
+++ b/qemu_multiarch_testing/parallel-build-hdc-img.sh
@@ -1,13 +1,14 @@
 #!/bin/sh
 
-export HDBMEGS=128
+export HDBMEGS=64
 
 build_in_dir()
 {
 	cd "$1" || exit 1
-	rm -f hdb.img 2>/dev/null
-	nice -n10 ./native-build.sh ../hdc.img
-	rm -f hdb.img 2>/dev/null
+	rm -f hdb.img
+	nice -n10 time ./native-build.sh ../hdc.img
+	rm -f hdb.img
+	echo >&3 "Finished: $1"
 }
 
 started=false
@@ -15,7 +16,7 @@
 	test -d "$dir" || continue
 	test -e "$dir/native-build.sh" || continue
 	echo "Starting: $dir"
-	build_in_dir "$dir" </dev/null >"$dir.log" 2>&1 &
+	build_in_dir "$dir" 3>&1 </dev/null >"$dir.log" 2>&1 &
 	started=true
 done