UBUNTU: [Packaging] move python3-dev to build-depends

python3-dev is now required by the regular kernel build process, move it
to build-depends.

Signed-off-by: Andrea Righi <andrea.righi@canonical.com>

debian.master/control.stub.in

@@ -19,6 +19,7 @@ Build-Depends:
  libpci-dev <!stage1>,
  pkg-config <!stage1>,
  python3 <!stage1>,
+ python3-dev <!stage1>,
  flex <!stage1>,
  bison <!stage1>,
  libunwind8-dev [amd64 arm64 armhf ppc64el] <!stage1>,
@@ -46,7 +47,6 @@ Build-Depends-Indep:
  bzip2 <!stage1>,
  sharutils <!stage1>,
  asciidoc <!stage1>,
- python3-dev <!stage1>,
  python3-sphinx <!stage1>,
  python3-sphinx-rtd-theme <!stage1>,
  fontconfig <!stage1>,