What I vouch for is not the relevant. I'm not a voucher.
The point is that Apache projects do not encourage downstream consumers to dip into SVN to grab unreviewed code. All sorts of issues can occur in such code.
For example, I've seen code, submitted under SGA, that contained a proprietary Microsoft header file. It was an honest mistake, and fixed as soon as found, but it very good that this did not spread to other products, due to the obvious consequences that can come from it. (Anyone remember SCO?).
The fact that other projects may have less concern for basic hygiene and are more willing to accept risk does not mean that we should encourage this. IMHO it would be irresponsible to encourage others to download and consume unreviewed code.
In any case, I truly do appreciate your concern, and your recognition that LibreOffice would greatly benefit from code from Apache OpenOffice. But it would sure be nice to hear it from them, with a real proposal for cooperation, then have it be argued by proxies.