needed to makedepends for inkscape 1.0

Binary-decimal and decimal-binary routines for IEEE doubles
https://github.com/google/double-conversion

This moves all packages from testing to unmaintained which have not been
updated for atleast 6 months. If you are affected by this commit please follow
this proceddure:

* make sure your packages build on all architectures
* move your pacakge(s) back to testing
* if you want to keep this package and can maintain it (or find somebody to
  maintain it for you) for a minimum of 6 months ask it to be moved to community

https://github.com/google/double-conversion
Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles