Revert "Trimmed the branch to only the 3rdparty/nlopt sub directory"

This reverts commit 55822ba34b3d3d4bbd2414895e8eae6cca00dc54.
Rebase from 'upstream'
Trimmed the branch to only the 3rdparty/nlopt sub directory
Revert "Trimmed the branch to only the 3rdparty/nlopt sub directory"

This reverts commit 89ba095c135ad9e5b9effc3c6fb3c48766c83398.
Rebase from 'upstream' (no changes)
Trimmed the branch to only the 3rdparty/nlopt sub directory