Support building a host version of minijail0

This change enables building a host version of minijail0. This is
desirable to run some host tests.

Bug: 78307138
Test: m out/host/linux-x86/bin/minijail0 && \
      out/host/linux-x86/bin/minijail0 -h

Change-Id: Iceb7f75d44c09dd8934ef3a9a70edb72ca94d3a4
Merged-Id: I7f29a8b04842fcd6a5054aebb54a97b3aa815124
(cherry picked from commit 413af658ee448c138830b3bc7eecb972f18fb6fc)
diff --git a/Android.bp b/Android.bp
index a52439e..cdda3c8 100644
--- a/Android.bp
+++ b/Android.bp
@@ -114,6 +114,7 @@
 // =========================================================
 cc_library {
     name: "libminijail",
+    host_supported: true,
 
     vendor_available: true,
     vndk: {
@@ -132,6 +133,14 @@
         shared_libs: minijailCommonLibraries,
     },
     export_include_dirs: ["."],
+
+    target: {
+        host: {
+            cflags: [
+                "-DPRELOADPATH=\"/invalidminijailpreload.so\"",
+            ],
+        },
+    },
 }
 
 // Example ASan-ified libminijail shared library for target.
@@ -341,6 +350,7 @@
 cc_binary {
     name: "minijail0",
     defaults: ["libminijail_flags"],
+    host_supported: true,
 
     cflags: [
         "-DPRELOADPATH=\"/invalidminijailpreload.so\"",