ltp: Add missing dependencies on coreutils, bc, e2fsprogs and gdb

When the tests are run we see messages like:

/opt/ltp/testcases/bin/run_cpuctl_stress_test.sh: line 242: nice: command not found
/opt/ltp/testcases/bin/run_cpuctl_test_fj.sh: line 66: tac: command not found
vma05 1 TCONF: 'gdb' not found
memcg_failcnt 1 TCONF: 'bc' not found
Owner=nobody; perms=-rw-------; sudo: lsattr: command not found

so add missing dependencies to avoid these.

(From OE-Core rev: c84c3caff4ef16c72390a7b941b71919417c9f51)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit faa01e1ae7a92d60699cd8865d1106a13549b096)
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/ltp/ltp_20200120.bb

@@ -83,13 +83,17 @@ do_install(){
 RDEPENDS_${PN} = "\
     attr \
     bash \
+    bc \
+    coreutils \
     cpio \
     cronie \
     curl \
+    e2fsprogs \
     e2fsprogs-mke2fs \
     expect \
     file \
     gawk \
+    gdb \
     gzip \
     iproute2 \
     ldd \