Vladimir Menshakov 86e6349ef7 find_program: Find programs that are executable but not readable ...

`find_program` internally uses `cmSystemTools::FileExists`
which calls `access(R_OK)` instead of `access(X_OK)`.
Use `cmSystemTools::IsFileExecutable` instead to fix this
issue.  An example of such a program is `sudo`.

Fixes: #10468

2020-04-09 08:08:50 -04:00

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