Simplify get_software_info's signature to just the extra dependency packages

As a consequence, SpecDependencies.extra can now be any data type that can be put into JSON; unhashable types previously caused a crash due to the lru_cache.

qwarc/utils.py

@@ -209,11 +209,11 @@ def _get_dependency_versions(*pkgs):
 
 
 @functools.lru_cache(maxsize = 1)
-def get_software_info(specFile, specDependencies):
+def get_software_info(specDependencyPackages):
 	# Based on crocoite.utils, authored by PromyLOPh in commit 6ccd72ab on 2018-12-08 under MIT licence
 	baseDependencyPackageVersions = list(_get_dependency_versions(__package__))
 	baseDependencyPackages = set(x[0] for x in baseDependencyPackageVersions)
-	specDependencyPackageVersions = list(_get_dependency_versions(*specDependencies.packages))
+	specDependencyPackageVersions = list(_get_dependency_versions(*specDependencyPackages))
 	return {
 		'platform': platform.platform(),
 		'python': {

qwarc/warc.py

@@ -68,7 +68,7 @@ class WARC:
 
 	def _write_warcinfo_record(self):
 		data = {
-			'software': qwarc.utils.get_software_info(self._specFile, self._specDependencies),
+			'software': qwarc.utils.get_software_info(self._specDependencies.packages),
 			'command': self._command,
 			'files': {
 				'spec': self._specFile,