tcl-native: Depend on zlib-native

tcl can use its internal zlib. If it detects zlib during configure, then it
gets removed from the sysroot during the build (since its no in DEPENDS),
it causes build failures.

Worse, if the configure test fails to find zlib, it still appents -lz to
the other autoconf tests meaning several fail when they shouldn't. This results
in conflicts with system macros and other bizarre issues.

The easiest fix is to depend on zlib-native and make things determinstic.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
oeqa/runtime/systemd: remove race in settle()

The settle() function had a race where services could still be activating at two
minutes but then when the final log is output, they've activated.

Remove this race and generally clean up the code.

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