cmd/link: quote PE .def library name

For Windows c-shared builds, peCreateExportFile writes a .def file
containing a LIBRARY directive. When the output name has a trailing dot,
as can happen for c-shared builds without an explicit -o, the directive
was emitted as:

	LIBRARY mypackage.

Some GNU ld versions reject that as invalid .def syntax.

Emit the library name as a quoted .def string instead:

	LIBRARY "mypackage."

This keeps ordinary output names working while allowing names with a
trailing dot.

Fixes #78238.

Cq-Include-Trybots: luci.golang.try:gotip-windows-amd64-longtest,gotip-windows-arm64
Change-Id: I45ddc09856016a0df233f73b8ec33ac7069a2aec
Reviewed-on: https://go-review.googlesource.com/c/go/+/793280
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
2 files changed
tree: 1c0cdc840e7775f1383ca1445178782532ef1236
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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