build(deps): bump Externals/libtheora from `91203fd` to `7180717`

Created by: dependabot-preview[bot]

Bumps Externals/libtheora from 91203fd to 7180717.

Commits

• 7180717 gitlab-ci: Add scons build.
• c5a83d0 Add a gitlab ci configuration.
• 1790452 build: fix make distcheck target
• 5f38d06 Avoid creating a Cairo buffer if all telemetry options are set to 0.
• f98989a scons: Fix indent.
• 94e68cc Use Python 3 compatible print function in SConstruct
• 31e885e Fix warning logical-op-parentheses
• f370e39 Remove wrong asm constraint modifier
• 4e0c499 CVE-2017-14633: Clean up and propagate the error check.
• 5159e32 CVE-2017-14633: Add check so we abort on too many channels
• Additional commits viewable in compare view

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