Ignore the environmental setting of LIBTOOL.
Patch is suggested by Adrian Bunk, to prevent unexpected
reflection of environmental LIBTOOL.  See:
http://savannah.nongnu.org/patch/?7290

* builds/unix/unix-cc.in: LIBTOOL is unconditionally set to
$(FT_LIBTOOL_DIR)/libtool.  FT_LIBTOOL_DIR is set to $(BUILD_DIR)
by default.
* configure: When configured for the building out of source tee,
FT_LIBTOOL_DIR is set to $(OBJ_DIR).
diff --git a/configure b/configure
index 2efa269..d05fd29 100755
--- a/configure
+++ b/configure
@@ -91,7 +91,7 @@
   echo "OBJ_DIR   := $abs_curr_dir"             >> Makefile
   echo "OBJ_BUILD := \$(OBJ_DIR)"               >> Makefile
   echo "DOC_DIR   := \$(OBJ_DIR)/reference"     >> Makefile
-  echo "LIBTOOL   := \$(OBJ_DIR)/libtool"       >> Makefile
+  echo "FT_LIBTOOL_DIR   := \$(OBJ_DIR)"        >> Makefile
   echo "ifndef FT2DEMOS"                        >> Makefile
   echo "  include \$(TOP_DIR)/Makefile"         >> Makefile
   echo "else"                                   >> Makefile