Fixed quoting in INSTALL check.

diff --git a/configure b/configure
index bdf2258..eaa5f65 100755
--- a/configure
+++ b/configure
@@ -4753,7 +4753,7 @@
 test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
 
 case "$INSTALL" in
-  \\/$* | ?:\\/* ) ;;
+  [\\/$]* | ?:[\\/]* ) ;;
   *)  INSTALL="\\\$(TOPSRCDIR)/$INSTALL" ;;
 esac