While glibc/eglibc looks for the time zone in /etc/localtime, other libc
alternatives (e.g. uclibc) may look for it in /etc/TZ. If /etc/TZ
exists, don't fall back to setting TZ to "UTC" in /etc/profile.
Signed-off-by: Richard Tollerton <rich.tollerton@ni.com> Signed-off-by: Ben Shelton <ben.shelton@ni.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>