minimal-bootstrap: trim diffutils-static output

Disable NLS and remove installed documentation from the static diffutils output. The bootstrap path keeps the diff, cmp, diff3, and sdiff binaries.

Size impact against upstream/staging:

- diffutils-static closure: 0.896 MiB -> 0.661 MiB (-0.235 MiB)

Assisted-by: codex with gpt-5.5-high

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

@@ -69,6 +69,7 @@ bash.runCommand "${pname}-${version}"
       --build=${buildPlatform.config} \
       --host=${hostPlatform.config} \
       --disable-dependency-tracking \
+      --disable-nls \
       CC=musl-gcc \
       CFLAGS=-static \
       ac_cv_path_PR_PROGRAM=pr
@@ -78,4 +79,7 @@ bash.runCommand "${pname}-${version}"
 
     # Install
     make -j $NIX_BUILD_CORES install-strip
+
+    # Remove documentation not needed in the bootstrap chain.
+    rm -rf $out/share
   ''