bash: fixed ptest run-builtins failed

1. redirect the stderr output of the command exec with -l option to
   /dev/null.
   Because when we run command exec with -l option in builtins.tests,
   it is a login shell, so it would read the file /etc/profile, that
   file executes the /usr/bin/resize which added by commit:
	 cc6360f4c4d97e0000f9d3545f381224ee99ce7d
   The /usr/bin/resize is produced by busybox that source code resize.c
   contains:
	fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
   In the end, it outputs an escape sequence to the stderr, so when we
   compare the test output file /tmp/xx with builtins.right, it failed.
   we need to redirect the stderr output to the /dev/null to solve the
   problem.

2. ensure the target system contains the locales "en_US.UTF-8".
   Because when run the run-builtins, it executes the source5.sub file
   that contain:
	LC_ALL=en_US.UTF-8
   such as add the following to the local.conf:
	IMAGE_LINGUAS_append = " en-us"

(From OE-Core rev: 5f82f3df7d4a7d6ae9a1ea3b6bc1d620a3d6c329)

(From OE-Core rev: 7107b7832a98c311f5020513229b091be6c4f769)

Signed-off-by: Dengke Du <dengke.du@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/bash/bash_4.3.30.bb

@@ -20,6 +20,7 @@ SRC_URI = "${GNU_MIRROR}/bash/${BP}.tar.gz;name=tarball \
            file://test-output.patch \
            file://fix-run-coproc-run-heredoc-run-execscript-run-test-f.patch \
            file://run-ptest \
+	   file://fix-run-builtins.patch \
            "
 
 SRC_URI[tarball.md5sum] = "a27b3ee9be83bd3ba448c0ff52b28447"