Build kzip for Go files in build/blueprint directory.

Bug: 137798757
Test: manual
Change-Id: If953425c80c60a64ebd6d50dddbac858ef091275
diff --git a/build_kzip.bash b/build_kzip.bash
index 89cd067..329825a 100755
--- a/build_kzip.bash
+++ b/build_kzip.bash
@@ -22,13 +22,14 @@
 build/soong/soong_ui.bash --build-mode --all-modules --dir=$PWD -k merge_zips xref_cxx xref_java
 #Build extraction file for Go files in build/soong directory.
 declare -r abspath_out=$(realpath "${out}")
-(cd build/soong;
- ../../prebuilts/build-tools/linux-x86/bin/go_extractor \
-    --goroot="${PWD}/../../prebuilts/go/linux-x86" \
-    --rules=vnames.go.json \
-    --canonicalize_package_corpus \
-    --output "${abspath_out}/soong/all.go.kzip" \
-    ./... )
+declare -r go_extractor=$(realpath prebuilts/build-tools/linux-x86/bin/go_extractor)
+declare -r go_root=$(realpath prebuilts/go/linux-x86)
+for dir in blueprint soong; do
+  (cd "build/$dir";
+   "$go_extractor" --goroot="$go_root" --rules=vnames.go.json --canonicalize_package_corpus \
+    --output "${abspath_out}/soong/build_${dir}.go.kzip" ./...
+  )
+done
 
 declare -r kzip_count=$(find "$out" -name '*.kzip' | wc -l)
 (($kzip_count>100000)) || { printf "Too few kzip files were generated: %d\n" $kzip_count; exit 1; }