[buteo] Fix test.xml failing to start unit tests. Contributes to JB#2…

…2786

Suspect related to commit afe6c2d which made the tests to be compiled
in separate directories. At least now they are shipped in separate
directories and the xml only refers the directory part.
Made the runner tool assume the test is named the same as the directory.

unittests/tests/runstarget.sh

@@ -21,7 +21,8 @@ cd "${TMP_DIR}"
 export LD_LIBRARY_PATH="${TESTS_DIR}:${LD_LIBRARY_PATH}"
 
 # Accept both absolute and relative path to test executable
-TEST="$(cd "${TESTS_DIR}"; readlink -f "${1}")"
+TESTDIR=$(cd "${TESTS_DIR}"; readlink -f "${1}")
+TEST=$(basename ${1})
 shift
 
-exec "${TEST}" "${@}" -maxwarnings 0
+exec "${TESTDIR}/${TEST}" "${@}" -maxwarnings 0