diffutils: Added perl to support ptest & Skipped one test case

Added perl to the run-time dependency of the recipe for diffutils since
it is required by the test "large-subpot".
The test "strip-trailing-cr" is skipped since it requires valgrind to
work, but valgrind is considered too heavy-weight for diffutils package.

(From OE-Core rev: 802c67c7c27011812d690c41347b38481cdab2e9)

Signed-off-by: Peiran Hong <peiran.hong@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/diffutils/diffutils/0001-Skip-strip-trailing-cr-test-case.patch

@@ -0,0 +1,35 @@
+From bd7fb8be2ae2d75347cf7733302d5093046ffa85 Mon Sep 17 00:00:00 2001
+From: Peiran Hong <peiran.hong@windriver.com>
+Date: Thu, 5 Sep 2019 15:42:22 -0400
+Subject: [PATCH] Skip strip-trailing-cr test case
+
+Skip the test "strip-trailing-cr" since it requires valgrind to
+work, but valgrind is considered too heavy-weight for diffutils
+package.
+
+Upstream-Status: Inappropriate [embedded specific]
+
+Signed-off-by: Peiran Hong <peiran.hong@windriver.com>
+---
+ tests/Makefile.am | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/tests/Makefile.am b/tests/Makefile.am
+index 83a7c9d..04d51b5 100644
+--- a/tests/Makefile.am
++++ b/tests/Makefile.am
+@@ -21,8 +21,10 @@ TESTS = \
+   stdin \
+   strcoll-0-names \
+   filename-quoting \
+-  strip-trailing-cr \
+   colors
++# Skipping this test since it requires valgrind
++# and thus is too heavy for diffutils package
++# strip-trailing-cr
+ 
+ XFAIL_TESTS = large-subopt
+ 
+-- 
+2.21.0
+

meta/recipes-extended/diffutils/diffutils_3.7.bb

@@ -5,6 +5,7 @@ require diffutils.inc
 
 SRC_URI = "${GNU_MIRROR}/diffutils/diffutils-${PV}.tar.xz \
            file://run-ptest \
+           file://0001-Skip-strip-trailing-cr-test-case.patch \
 "
 
 SRC_URI[md5sum] = "4824adc0e95dbbf11dfbdfaad6a1e461"
@@ -17,7 +18,7 @@ acpaths = "-I ./m4"
 
 inherit ptest
 
-RDEPENDS_${PN}-ptest += "make"
+RDEPENDS_${PN}-ptest += "make perl"
 
 do_install_ptest() {
 	t=${D}${PTEST_PATH}