tzdata: bump to 2018c

Signed-off-by: Adam Duskett <Adamduskett@outlook.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/tzdata/tzdata.hash

@@ -1,2 +1,2 @@
-# From http://mm.icann.org/pipermail/tz-announce/2017-October/000047.html
-sha512 feb5c544e617b30c73a397e5a1c51f9847d0fddf1dfa0f9ace2e6f686786f09b666937b2048e07075c84593fc584bd5a25d639fce70eca9735267df28621ab4c	tzdata2017c.tar.gz
+# From http://mm.icann.org/pipermail/tz-announce/2018-January/000048.html
+sha512 0575c87c9ffcde7b7f62b0df928d8a0e8d93f832b5ef7227b3d8431686f851f1fd5372c7e768f2979830352433b31df7f3979a00c28ea3973a3a0987ebbfb835	tzdata2018c.tar.gz

package/tzdata/tzdata.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-TZDATA_VERSION = 2017c
+TZDATA_VERSION = 2018c
 TZDATA_SOURCE = tzdata$(TZDATA_VERSION).tar.gz
 TZDATA_SITE = http://www.iana.org/time-zones/repository/releases
 TZDATA_STRIP_COMPONENTS = 0