tzdata: Install zone1970.tab

The modern version of zone.tab is required by tzselect e.g.

(From OE-Core rev: de467998ecfa5fa1d2e9dd43a4a3d828cf9ccade)

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-extended/tzdata/tzdata_2017b.bb

@@ -45,6 +45,7 @@ do_install () {
         cp -pPR ${S}/$exec_prefix ${D}/
         # libc is removing zoneinfo files from package
         cp -pP "${S}/zone.tab" ${D}${datadir}/zoneinfo
+        cp -pP "${S}/zone1970.tab" ${D}${datadir}/zoneinfo
         cp -pP "${S}/iso3166.tab" ${D}${datadir}/zoneinfo
 
         # Install default timezone
@@ -206,6 +207,7 @@ FILES_${PN} += "${datadir}/zoneinfo/Pacific/Honolulu     \
                 ${datadir}/zoneinfo/WET                  \
                 ${datadir}/zoneinfo/Zulu                 \
                 ${datadir}/zoneinfo/zone.tab             \
+                ${datadir}/zoneinfo/zone1970.tab         \
                 ${datadir}/zoneinfo/iso3166.tab          \
                 ${datadir}/zoneinfo/Etc/*"