rsnapshot: add (commented) code for an idea that did not work out yet
dovecot: Update from 2.2.14 to 2.2.15
postfix: Update from 2.11.1 to 2.11.3
arduino-core: fixup ELF interperter paths in prebuilt binaries

Fixes #4688
titaniumenv: Make iOS SDK version configurable in example
quassel: 0.10.0 -> 0.11.0
Ats2: bump
quassel: Fix evaluation
haskell-idris: update to version 0.9.15
libtorrent-rasterbar: 0.16.0 -> 1.0.2
Make boost 156 the default
boost: Change header output name
boost: Fix library dependencies
Revert "boost: Quick eval fix"

This reverts commit eb3794186c7357c9cf1abc5d9162d16f29526996.
boost: Remove boost.lib
boost: Remove legacy users
boost: Remove old boost
boost: Fix incompatible applications