GH322: Fix typo in generated comment.

Reviewed-by: NViktor Dukhovni <viktor@openssl.org>

util/mk1mf.pl

@@ -612,7 +612,7 @@ $defs= <<"EOF";
 # N.B. You MUST use -j on FreeBSD.
 # This makefile has been automatically generated from the OpenSSL distribution.
 # This single makefile will build the complete OpenSSL distribution and
-# by default leave the 'intertesting' output files in .${o}out and the stuff
+# by default leave the 'interesting' output files in .${o}out and the stuff
 # that needs deleting in .${o}tmp.
 # The file was generated by running 'make makefile.one', which
 # does a 'make files', which writes all the environment variables from all