Avoid quadratic complexity due to string concatenations.

[pspp] / ChangeLog

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+2006-09-17  Bruno Haible  <bruno@clisp.org>
+
+       * gnulib-tool (func_append): New function, stolen from libtool.m4.
+       (func_modules_transitive_closure, func_modules_add_dummy,
+       func_modules_to_filelist, func_import, func_create_testdir,
+       func_create_megatestdir, ...): Use it wherever possible.
+       Suggested by Ralf Wildenhues.
+
 2006-09-15  Ralf Wildenhues  <Ralf.Wildenhues@gmx.de>
 
        Speed up by a factor of 1.12.