timezone data has been split into the package sys-libs/timezone-data

diff -durN glibc-2.10.1.orig/Makeconfig glibc-2.10.1/Makeconfig
--- glibc-2.10.1.orig/Makeconfig	2009-11-13 00:50:13.000000000 +0100
+++ glibc-2.10.1/Makeconfig	2009-11-13 00:50:41.000000000 +0100
@@ -919,7 +919,7 @@
 	      stdlib stdio-common libio malloc string wcsmbs time dirent    \
 	      grp pwd posix io termios resource misc socket sysvipc gmon    \
 	      gnulib iconv iconvdata wctype manual shadow gshadow po argp   \
-	      crypt nss localedata timezone rt conform debug		    \
+	      crypt nss localedata rt conform debug		    \
 	      $(add-on-subdirs) $(dlfcn) $(binfmt-subdir)
 
 ifndef avoid-generated
