cpio: fix ptest failure

Fix following ptest failure:
/usr/lib64/cpio/ptest/run-ptest: line 7: cd: /usr/lib/cpio/ptest/tests/: No such file or directory

(From OE-Core rev: 1809329c336cb509349bd39f13cc78acd8efe0cd)

Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/cpio/cpio-2.13/run-ptest

@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # Define cpio test work dir
-WORKDIR=/usr/lib/cpio/ptest/tests/
+WORKDIR=@PTEST_PATH@/tests/
 
 # Run test
 cd ${WORKDIR}

meta/recipes-extended/cpio/cpio_2.13.bb

@@ -56,6 +56,7 @@ do_install_ptest() {
     install --mode=755 ${B}/tests/atlocal ${D}${PTEST_PATH}/tests/
     install --mode=755 ${B}/tests/genfile ${D}${PTEST_PATH}/tests/
     install --mode=755 ${S}/tests/testsuite ${D}${PTEST_PATH}/tests/
+    sed -i "s#@PTEST_PATH@#${PTEST_PATH}#g" ${D}${PTEST_PATH}/run-ptest
 }
 
 PACKAGES =+ "${PN}-rmt"