move build.rs and friends to pbs-buildcfg

with this the main crate won't be re-compiled every time a
*binary* is modified

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

Cargo.toml

@@ -15,7 +15,6 @@ edition = "2018"
 license = "AGPL-3"
 description = "Proxmox Backup"
 homepage = "https://www.proxmox.com"
-build = "build.rs"
 
 exclude = [ "build", "debian", "tests/catar_data/test_symlink/symlink1"]