Remove use of PKG_CHECK_VAR introduced in 4b0861ae.  Closes: #271.
scrobbler2: improvements to the configuration migration procedure (Feature #263).

Scrobbler2 will be enabled if the old scrobbler was enabled.
Only migrate the settings once, and only if the old scrobbler was configured.
scrobbler2: Inverted logic on the check for migrated preferences.
search-tool: Always return MAX_RESULTS if >= MAX_RESULTS are found.
Update translations from Transifex. 4 new languages: Greek, Finnish, Indonesian, Kirgyz.
amidi-plug: Fix cppcheck warnings
sndio: Fix buffer overflow due to using strlcpy().  Closes: #277.
adplug: Minimal fixes for warnings with GCC 4.8.
console: Fix use of uninitialized values if fread() fails.