maemo/hildon-thumbnail: update to 3.1.2

gstreamer 0.10 has been dropped from Alpine, but hildon-thumbnail 3.0.51
was still depending on it. Update to 3.1.2, where it now depends on
gstreamer 1.0 (which is in Alpine).

The aarch64 patch can be dropped, it does not apply anymore, and
building for aarch64 works without it.
5 jobs for master in 2 minutes and 48 seconds
Status Job ID Name Coverage
  First
passed #232957695
aports-static

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passed #232957694
py-sh-static

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passed #232957693
wiki

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  Second
passed #232957697
aports-build

00:01:33

passed #232957696
aports-static-upstream

00:00:48