qmmp: add meta.respositories

This metadata is used by the tool @phreedom is writing to automatically
find package updates.
newsbeuter: add dev expression
json-c: add meta.platforms and break overlong line
Fixes go 1.1.2 compilation on OSX Maverick

Apparently Apple thinks that faking gcc wiht a clang stub but not providing a
compatile libgcc.a is not going to cause any issues. They really do hate GPL.