Log Message:
Updated automake to 1.15.1.

New in 1.15.1:

* Bugs fixed:

  - The code has been adapted to remove a warning present since Perl
    5.22 stating that "Unescaped left brace in regex is deprecated".
    This warning has become an hard error in Perl 5.26 (bug#22372).

  - The generated Makefiles do not rely on the obsolescent GZIP
    environment variable which was used for passing arguments to
    'gzip'.  Compatibility with old versions has been
    preserved. (bug#20132)

* Miscellaneous changes:

  - Support the Windows version of the Intel C Compiler (icl) in the
    'compile' script in the same way the (compatible) Microsoft C
    Compiler is supported.