[quickfix] Remove vendored double-conversion

[vicroms]

Fix CI failures

[BillyONeal]

The parts of this patch that came from fix-build.patch don't appear to be about devendoring double-conversion. Since it fixes a baseline issue and this does avoid patches on patches, not going to request changes over this.

[Copilot]

Pull request overview

Quickfix is failing in CI because it includes vendored double-conversion .cc files that conflict with system/upstream versions. This PR devendors double-conversion, adding it as an explicit vcpkg dependency, replacing the previous build-fix patch with a combined patch, and wiring the dependency into the installed CMake config.

Changes:

• Replace 00001-fix-build.patch with 00001-devendor-double-conversion.patch that links against double-conversion::double-conversion and removes vendored .cc includes.
• Add double-conversion to dependencies and prepend find_dependency(double-conversion CONFIG) to the installed quickfix-config.cmake.
• Bump port-version to 1 and update the versions database.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
ports/quickfix/vcpkg.json	Adds double-conversion dep and bumps port-version.
ports/quickfix/portfile.cmake	Switches patch reference; injects find_dependency into the installed config.
ports/quickfix/00001-fix-build.patch	Removed; superseded by the new combined patch.
ports/quickfix/00001-devendor-double-conversion.patch	New patch combining build fixes and devendoring of double-conversion.
versions/baseline.json	Bumps quickfix baseline port-version to 1.
versions/q-/quickfix.json	Adds new version entry with updated git-tree.

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