Migration of libc++ weirdly blocked by already-fixed bug

[Boyuan Yang]

Hello all,

I was checking the version of libc++ in Debian archive [1] and found that 
package "libc++" failed to migrate to testing  in last three years.

While checking for migration excuses, I found that the statement of excuse is 
kind of weird. Currently it says: [2]

Excuse for libc++

    Migration status: BLOCKED: Rejected/introduces a regression (please see 
below)
    Too young, only 0 of 5 days old
    missing build on armel: libc++-dev, libc++-helpers, libc++-test, libc++1, 
libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.1-2)
    missing build on armhf: libc++-dev, libc++-helpers, libc++-test, libc++1, 
libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.0-1)
    missing build on mips: libc++-dev, libc++-helpers, libc++-test, libc++1, 
libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.1-3)
    missing build on mips64el: libc++-dev, libc++-helpers, libc++-test, libc+
+1, libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.0-1)
    missing build on mipsel: libc++-dev, libc++-helpers, libc++-test, libc++1, 
libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.1-3)
    missing build on ppc64el: libc++-dev, libc++-helpers, libc++-test, libc+
+1, libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.1-3)
    missing build on s390x: libc++-dev, libc++-helpers, libc++-test, libc++1, 
libc++abi-dev, libc++abi-test, libc++abi1 (from 3.9.1-3)
    libc++ has new bugs!
    Updating libc++ introduces new bugs: #870440
    Piuparts tested OK - https://piuparts.debian.org/sid/source/libc/libc+
+.html
    Not considered 

Bug #870040 has been fixed for a while [3] yet the excuse still mentions it.

I think it might be a bug in QA scripts. Could you please look into it and 
make the excuse correct (which is FTBFS on certain architectures, not 
introducing new bugs)?

Thanks,

Boyuan Yang

[1] https://tracker.debian.org/pkg/libc++
[2] https://qa.debian.org/excuses.php?package=libc%2B%2B
[3] https://bugs.debian.org/870440
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