Fix compilation when building static library [21059]

[richiware]

Description

Static library generation is not working in 3.x. This PR fixes it.

Contributor Checklist

• Commit messages follow the project guidelines.
• The code follows the style guidelines of this project.
• N/A Tests that thoroughly check the new feature have been added/Regression tests checking the bug and its fix have been added; the added tests pass locally
• N/A Any new/modified methods have been properly documented using Doxygen.
• N/A Any new configuration API has an equivalent XML API (with the corresponding XSD extension)
• N/A Changes are backport compatible: they do NOT break ABI nor change library core behavior.
• N/A Changes are API compatible.
• N/A New feature has been added to the versions.md file (if applicable).
• N/A New feature has been documented/Current behavior is correctly described in the documentation.
• N/A Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

[MiguelCompany]

Manual build with -DBUILD_SHARED_LIBS=OFF:

• Ubuntu

[MiguelCompany]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[MiguelCompany]

@richiware Build failed when linking in this manual run where I passed -DBUILD_SHARED_LIBS=OFF

[MiguelCompany]

@richiprosima Please test_3 discovery-server

[MiguelCompany]

LGTM with green build.

Local build with -DBUILD_SHARED_LIBS=OFF success on windows and Ubuntu

[MiguelCompany]

@Mergifyio rebase

[mergify]

rebase

☑️ Nothing to do

• any of:
  • #commits-behind>0 [📌 rebase requirement]
  • #commits>1 [📌 rebase requirement]
  • -linear-history [📌 rebase requirement]
• -closed [📌 rebase requirement]
• -conflict [📌 rebase requirement]
• queue-position=-1 [📌 rebase requirement]

[MiguelCompany]

@richiprosima Please test_3 discovery-server

[MiguelCompany]

@richiprosima please test_3 linux

[elianalf]

@richiprosima Please test_3 discovery-server