Fixes error 'AC_CONFIG_MACRO_DIR can only be used once'. #483
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Fixes this error:
hidapi % ./bootstrap
autoreconf: export WARNINGS=
autoreconf: Entering directory '.'
autoreconf: configure.ac: not using Gettext
autoreconf: running: aclocal --force -I m4
configure.ac:23: error: AC_CONFIG_MACRO_DIR can only be used once
./lib/autoconf/general.m4:1970: AC_CONFIG_MACRO_DIR is expanded from...
configure.ac:23: the top level