switch to CGO-free builds

vendor/modernc.org/libc/AUTHORS

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+# This file lists authors for copyright purposes.  This file is distinct from
+# the CONTRIBUTORS files.  See the latter for an explanation.
+#
+# Names should be added to this file as:
+#     Name or Organization <email address>
+#
+# The email address is not required for organizations.
+#
+# Please keep the list sorted.
+
+Dan Kortschak <dan@kortschak.io>
+Dan Peterson <danp@danp.net>
+Jan Mercl <0xjnml@gmail.com>
+Jason DeBettencourt <jasond17@gmail.com>
+Koichi Shiraishi <zchee.io@gmail.com>
+Marius Orcsik <marius@federated.id>
+Scot C Bontrager <scot@indievisible.org>
+Steffen Butzer <steffen(dot)butzer@outlook.com>