small fix to automake for updated perl

[rain1]

Hello!
Here is a small fix to automake so that it works in recent versions of 
perl.

Currently, with perl 5.26 I get this error while trying to build 
automake from source:
Unescaped left brace in regex is illegal here in regex; marked by <-- 
HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at automake-1.15/bin/automake 
line 3936.

this patch fixes that by escaping the braces.

0001-minor-bug-fix-to-bin-automake.in.patch
Description: Text Data