Sync rust-toolset macros to rust-packaging v25.2
    
    This bring RHEL rust-toolset in sync with the latest Fedora
    rust-packaging, most importantly:
    
    * Fedora's new style (-v vendor) vendoring is implemented. The old RHEL
    style (-V #) vendoring is still supported, at least until we can convert
    everything in ELN.
    
    * Automatic generation of bundled provides using %cargo_vendor_manifest.
    However, instead of depending on cargo2rpm, a very stripped-down version
    of just its parse-vendor-manifest command is provided as a private
    script, along with a fileattr to call it.
    
    Other changes incorporated in this commit:
    
    * -Cstrip=none added to %build_rustflags.
    
    * --profile rpm is used instead of --release.
    
    * Errors in spawned commands are now caught.
    
    * Comments and whitespace are synced for easier comparison with Fedora.
    
    * --target all is dropped from license and vendor macros, to avoid false
      alarms from windows crates.