Fix: build when OPENVASD 0, AGENTS 1 and CREDENTIAL_STORES 1

[mattmundell]

What

Fix the build when openvasd is off and the other two are on.

Why

The http dir was being included multiple times.

Testing

Building with -D ENABLE_AGENTS=1 -D ENABLE_CREDENTIAL_STORES=1 -D ENABLE_CONTAINER_SCANNING=1 -D ENABLE_OPENVASD=0 before:

CMake Error at CMakeLists.txt:336 (add_subdirectory):
  The binary directory

    /path/to/build/gvm-libs/http

  is already used to build a source directory.  It cannot be used to build
  source directory

    /path/to/main/gvm-libs/http

  Specify a unique binary directory name.

Whereas after the PR it succeeds.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Snapshot Warnings

⚠️: No snapshots were found for the head SHA 2035c16.

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Scanned Files

None

[greenbonebot]

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