simplify tzdata folder structure

tzdata.patch

diff -ur buildroot/package/tzdata/tzdata.mk buildroot-patched/package/tzdata/tzdata.mk
--- buildroot/package/tzdata/tzdata.mk	2020-08-26 21:07:57.000000000 +0200
+++ buildroot-patched/package/tzdata/tzdata.mk	2020-08-27 16:54:38.000000000 +0200
@@ -41,18 +41,13 @@
 define TZDATA_INSTALL_TARGET_CMDS
 	$(INSTALL) -d -m 0755 $(TARGET_DIR)/usr/share/zoneinfo
 	cp -a $(HOST_DIR)/share/zoneinfo/* $(TARGET_DIR)/usr/share/zoneinfo
-	cd $(TARGET_DIR)/usr/share/zoneinfo; \
-	for zone in posix/*; do \
-	    ln -sfn "$${zone}" "$${zone##*/}"; \
-	done
 	$(TZDATA_SET_LOCALTIME)
 endef
 
 define HOST_TZDATA_BUILD_CMDS
 	(cd $(@D); \
 		for zone in $(TZDATA_ZONELIST); do \
-			$(ZIC) -d _output/posix -y yearistype.sh $$zone || exit 1; \
-			$(ZIC) -d _output/right -L leapseconds -y yearistype.sh $$zone || exit 1; \
+			$(ZIC) -d _output -y yearistype.sh $$zone || exit 1; \
 		done; \
 	)
 endef