Use newer autoconf for bash to avoid warnings.

We can use either 2.55 or 2.57, so use the newer.

parts.rst

@@ -495,5 +495,5 @@ bash 3.2.57
 Up to this point, our build of ``bash`` could run scripts but could not be used
 interactively.  This newer version of ``bash`` compiles without any patches,
 provides new features, and is built with GNU readline support so it can be used
-as an interactive shell. autoconf 2.52 is used to regenerate the configure
+as an interactive shell. ``autoconf-2.57`` is used to regenerate the configure
 script and bison is used to recreate some included generated files.

sysa/bash-3.2.57/bash-3.2.57.sh

@@ -9,7 +9,7 @@ src_prepare() {
     # Rebuild configure script
     # Ignore harmless error from autoconf for now
     rm configure
-    autoconf-2.52 || true
+    autoconf-2.57
 }
 
 src_configure() {

sysa/bash-3.2.57/checksums

@@ -1 +1 @@
-0d6cbaa5f93fa4c2186ef40dd834b47841b3bf70f6183cfdb6ada38fdb835c5a  /after/bin/bash
+62c5acf91b425c3587b498ce7af14fcfed6735db1bfd8d94055a4795aff57b09  /after/bin/bash