autoconf: Remove standards.info

It is installed by several GNU packages, leading to linking conflicts,
and it is not very useful.

Closes Homebrew/legacy-homebrew#25600.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/autoconf.rb

@@ -25,6 +25,7 @@ def install
     inreplace 'man/autoreconf.1', 'libtoolize', 'glibtoolize'
     system "./configure", "--prefix=#{prefix}"
     system "make install"
+    rm_f info/'standards.info'
   end
 
   test do