[cmake] Kudu should compile on Mac OS without SDKROOT set.

Cmake figures out the sdkroot path perfectly without the environment
variable SDKROOT. The only thing that fails is the linker test in
cmake_modules/KuduLinker.cmake. Setting SDKROOT is also missing from
the docs/installation.adoc, although it is mandatory (it should not).

Change-Id: I1cfe84f31238ccb208bdf49e8b05688107dd5ae2
Reviewed-on: http://gerrit.cloudera.org:8080/19935
Tested-by: Kudu Jenkins
Reviewed-by: Attila Bukor <abukor@apache.org>
Tested-by: Attila Bukor <abukor@apache.org>
1 file changed