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makefiles: Replace
which
with command -v
As the POSIX documentation[1] of `command -v` guarantees that on error there will be no output (and there will be output in the other cases), the tests in Makefiles were simplified to test for output equality to the empty string. Redirects swallowing error outputs were removed, as the command produces no error output there (as recommended at [2]). Existing uses of `command` are simplified as well. [1]: https://pubs.opengroup.org/onlinepubs/9699919799/utilities/command.html [2]: https://salsa.debian.org/debian/debianutils/-/blob/master/debian/NEWS
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