diffstat: fix autoheader warning due to missing AC_DEFINE template

(From OE-Core rev: 9c9da40b6de2cd29378e56fef643305872a52f62)

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

meta/recipes-devtools/diffstat/diffstat/aclocal-popen.patch

@@ -0,0 +1,20 @@
+Add a description to the HAVE_POPEN_PROTOTYPE AC_DEFINE so that this define is
+included in config.h.
+
+Upstream-Status: Submitted (via email)
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+
+diff --git a/aclocal.m4 b/aclocal.m4
+index 3f20573..ec5ca51 100644
+--- a/aclocal.m4
++++ b/aclocal.m4
+@@ -931,7 +931,7 @@ ac_cv_td_popen=no,
+ ac_cv_td_popen=yes))
+ AC_MSG_RESULT($ac_cv_td_popen)
+ if test $ac_cv_td_popen = yes; then
+-	AC_DEFINE(HAVE_POPEN_PROTOTYPE)
++	AC_DEFINE(HAVE_POPEN_PROTOTYPE,[1],[Conflicting popen prototype])
+ fi
+ ])dnl
+ dnl ---------------------------------------------------------------------------

meta/recipes-devtools/diffstat/diffstat_1.58.bb

@@ -10,6 +10,7 @@ LIC_FILES_CHKSUM = "file://install-sh;endline=42;md5=b3549726c1022bee09c174c72a0
 SRC_URI = "ftp://invisible-island.net/diffstat/diffstat-${PV}.tgz \
            file://dirfix.patch \
            file://aclocal.patch \
+           file://aclocal-popen.patch \
            file://run-ptest \
 "