autoconf: upgrade to 2.71

After too many years, autoconf has made a new release.  On the whole it
is compatible with previous releases, but some macros are more specific
about what they expose so minor tweaks to configure.ac may be required.

autoconf also now invokes intltoolize, gtkdocize, and copies
config.sub/guess, so there is less work for autotools.bbclass to do.

- AC_HEADER_MAJOR-port-to-glibc-2.25.patch
- add_musl_config.patch
- autoconf-replace-w-option-in-shebangs-with-modern-use-warnings.patch
- autoreconf-gnuconfigize.patch
- check-automake-cross-warning.patch
- config_site.patch
- fix_path_xtra.patch
- performance.patch
Drop a number of patches which have been integrated upstream.

- man-host-perl.patch
Don't use the target perl path when building documentation at build time:

- no-man.patch
Don't build documentation in native builds to avoid further build
dependencies.

(From OE-Core rev: f5dd2e0acbb0aa4079c51aaeab8c26e743a4c714)

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/autoconf/autoconf/program_prefix.patch

@@ -1,20 +1,26 @@
-Upstream-Status: Pending
+From f4f19a5c03e8ae3b9cc93d24b76694f4b7b2eb76 Mon Sep 17 00:00:00 2001
+From: Ross Burton <ross.burton@intel.com>
+Date: Thu, 12 Mar 2020 17:28:38 +0000
+Subject: [PATCH 3/7] program_prefix.patch
 
-#
-# Patch managed by http://www.mn-logistik.de/unsupported/pxa250/patcher
-#
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+---
+ lib/autoconf/general.m4 | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
 
---- autoconf-2.57/lib/autoconf/general.m4~program_prefix
-+++ autoconf-2.57/lib/autoconf/general.m4
-@@ -1676,8 +1676,9 @@
+diff --git a/lib/autoconf/general.m4 b/lib/autoconf/general.m4
+index 16f0d074..4c5e0b36 100644
+--- a/lib/autoconf/general.m4
++++ b/lib/autoconf/general.m4
+@@ -2070,7 +2070,7 @@ _AC_CANONICAL_SPLIT([target])
+ 
  # The aliases save the names the user supplied, while $host etc.
  # will get canonicalized.
- test -n "$target_alias" &&
--  test "$program_prefix$program_suffix$program_transform_name" = \
--    NONENONEs,x,x, &&
-+  test "$target_alias" != "$host_alias" &&
-+    test "$program_prefix$program_suffix$program_transform_name" = \
-+      NONENONEs,x,x, &&
+-test -n "$target_alias" &&
++test -n "$target_alias" && test "$target_alias" != "$host_alias" &&
+   test "$program_prefix$program_suffix$program_transform_name" = \
+     NONENONEs,x,x, &&
    program_prefix=${target_alias}-[]dnl
- ])# AC_CANONICAL_TARGET
- 
+-- 
+2.25.1
+