When the user specifies a path such as ./test we'd incorrectly look for
the binary in the PATH environment variable and end up executing an
incorrect binary (e.g. /bin/test). We should only look up binaries in
PATH if the user-specified path does not contain a slash.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
