Made MOO_BUILD_MEDIT and MOO_PACKAGE_NAME precious variables

m4/moo-dirs.m4

@@ -2,11 +2,12 @@
 # MOO_AC_SET_DIRS
 #
 AC_DEFUN_ONCE([MOO_AC_SET_DIRS],[
+  AC_ARG_VAR([MOO_PACKAGE_NAME], [data files go into $datadir/$MOO_PACKAGE_NAME, etc.])
+
   if test "x$MOO_PACKAGE_NAME" = x; then
     MOO_PACKAGE_NAME=moo
   fi
 
-  AC_SUBST(MOO_PACKAGE_NAME)
   AC_DEFINE_UNQUOTED([MOO_PACKAGE_NAME], "$MOO_PACKAGE_NAME", [package name])
 
   MOO_DATA_DIR="${datadir}/$MOO_PACKAGE_NAME"

m4/moo-lib.m4

@@ -22,6 +22,7 @@ AC_DEFUN_ONCE([MOO_AC_LIB],[
     MOO_PYTHON_BUILTIN=false
   fi
 
+  AC_ARG_VAR([MOO_BUILD_MEDIT], [build medit])
   if test "x$MOO_BUILD_MEDIT" != "xfalse"; then
     MOO_BUILD_MEDIT=true
   fi