m4/README: Add.

[coloredstderr/coloredstderr.git] / m4 / README

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+README
+======
+
+The following files were copied unmodified from the autoconf archive [1]
+(2011-12-21). Thanks.
+
+[1]: http://www.gnu.org/software/autoconf-archive/
+
+- ax_c___attribute__.m4