check_load hardcodes path to 'uptime' (#1394)

[Elan Ruusamäe]

@orlitzky i understand the problem you had, in my distro it can be fixed
with marking procps 3.3.10 to conflict with monitoring-plugins < 2.1.1-2,
where monitoring-plugins == 2.1.1-2 is the "new" version that uses paths
from 3.3.10, so users are forced to upgrade both or neither.

as for looking up programs from `PATH` security concern, there already
exists `--with-trusted-path=PATH` configure option, so it should be "secure"
to search them from there runtime. and i think it would also simplify whole
`configure.ac` and probably cruft needed to add support for new program for
use of plugin.

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