trivial diff: tools/bootcheck: pass down --use-subdirs

[Fergus Henderson]

tools/bootcheck:
	Pass the value of the --use-subdirs option down to
	subprocesses via the MMAKE_USE_SUBDIRS environment variable.
	This ensures that `tools/bootcheck --use-subdirs' actually
	uses `--use-subdirs' when building the stage2 and stage3
	compilers and when running the test suite.

Index: tools/bootcheck
===================================================================
RCS file: /home/mercury1/repository/mercury/tools/bootcheck,v
retrieving revision 1.56
diff -u -r1.56 bootcheck
--- bootcheck	1998/05/28 10:08:08	1.56
+++ bootcheck	1998/05/30 11:52:24
@@ -153,6 +153,9 @@
 		;;
 esac
 
+MMAKE_USE_SUBDIRS=$use_subdirs
+export MMAKE_USE_SUBDIRS
+
 echo "starting at `date`"
 
 set -x

-- 
Fergus Henderson <fjh at cs.mu.oz.au>  |  "I have always known that the pursuit
WWW: <http://www.cs.mu.oz.au/~fjh>  |  of excellence is a lethal habit"
PGP: finger fjh at 128.250.37.3        |     -- the last words of T. S. Garp.