Fix typo in Makefile.in comments
diff --git a/Makefile.in b/Makefile.in
index 07a769f..a349b07 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -31,7 +31,7 @@
# A note about host libraries:
#
# The only libraries that get promoted to stageN/lib are those needed
-# by rustc. In general, rustc programs, even those compiled for the
+# by rustc. In general, rust programs, even those compiled for the
# host architecture will use libraries from the target
# directories. This gives rust some freedom to experiment with how
# libraries are managed and versioned without polluting the common
