apr: Fix to work with autoconf 2.70

Fix an issue with autoconf 2.70 where duplicate macro includes
caused configure failures.

(From OE-Core rev: 4e5d7c86a8a5e752df451d988861a86236e8c8ff)

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

meta/recipes-support/apr/apr/autoconf270.patch

@@ -0,0 +1,22 @@
+With autoconf 2.70 confdefs.h is already included. Including it twice generates
+compiler warnings and since this macros is to error on warnings, it breaks.
+
+Fix by not including the file.
+
+Upstream-Status: Pending
+RP - 2021/1/28
+
+Index: apr-1.7.0/build/apr_common.m4
+===================================================================
+--- apr-1.7.0.orig/build/apr_common.m4
++++ apr-1.7.0/build/apr_common.m4
+@@ -505,8 +505,7 @@ AC_DEFUN([APR_TRY_COMPILE_NO_WARNING],
+  fi
+  AC_COMPILE_IFELSE(
+   [AC_LANG_SOURCE(
+-   [#include "confdefs.h"
+-   ]
++   []
+    [[$1]]
+    [int main(int argc, const char *const *argv) {]
+    [[$2]]

meta/recipes-support/apr/apr_1.7.0.bb

@@ -23,6 +23,7 @@ SRC_URI = "${APACHE_MIRROR}/apr/${BPN}-${PV}.tar.bz2 \
            file://0007-explicitly-link-libapr-against-phtread-to-make-gold-.patch \
            file://libtoolize_check.patch \
            file://0001-Add-option-to-disable-timed-dependant-tests.patch \
+           file://autoconf270.patch \
            "
 
 SRC_URI[md5sum] = "7a14a83d664e87599ea25ff4432e48a7"