[B, C, unstable] move {meta, signed} versioned depends to Build-Depends-Arch:

[Kamal Mostafa]

In order to construct source packages in a stable chroot, various versioned
Build-Depends: packages in -meta and -signed need to be moved to
Build-Depends-Arch: instead.  These packages and are not actually needed in the
source package construction environment.

One patch to each of -meta and -signed needs to be applied.

Note that this is only a concern for Bionic and later series (prior to Bionic,
debuild's default behavior around its -d options was different).

 -Kamal