preflight: require libtoolize on Linux, not libtool
preflight: require libtoolize on Linux, not libtool

Modern Ubuntu-based distros have split libtool into an architecture
independent package (libtool) and a dependent package (libtool-bin). Only
the former is needed to build thirdparty, and it contains the binary
'libtoolize', not 'libtool', so let's check for that. Older Linux distros
include both, so this change shouldn't affect them.

Change-Id: I590c9fbdc920da100aa3e4a9cd8cca8847569968
Reviewed-on: http://gerrit.cloudera.org:8080/2646
Tested-by: Kudu Jenkins
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>

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