Fallback to more lax parsing of SPDX expressions #503
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We parse SPDX expressions from the packages license with strict rules, but cargo/crates.io allow expressions that violate the SPDX spec, notably the GNU licenses have the annoying behavior of not using
+like every other license and instead use the-or-lateror-onlysuffixes. If we fail strict parsing, we instead now fallback to more lax parsing so users don't get baseless errors.Resolves: #498