minimal-bootstrap: trim gnutar-static output

Disable NLS and remove installed documentation plus the remote tape helper. The stage0 bootstrap path only needs the static tar binary.

Size impact against upstream/staging:

- gnutar-static closure: 3.772 MiB -> 0.826 MiB (-2.946 MiB)

Assisted-by: codex with gpt-5.5-high

pkgs/os-specific/linux/minimal-bootstrap/gnutar/static.nix

@@ -62,6 +62,7 @@ bash.runCommand "${pname}-${version}"
       --build=${buildPlatform.config} \
       --host=${hostPlatform.config} \
       --disable-dependency-tracking \
+      --disable-nls \
       CC=musl-gcc \
       CFLAGS=-static
 
@@ -70,4 +71,5 @@ bash.runCommand "${pname}-${version}"
 
     # Install
     make -j $NIX_BUILD_CORES install-strip
+    rm -rf $out/libexec $out/share
   ''