WVCdm version stamping

First, version.txt will be stamped by Android CI with a release
candidate name like "ZV1A.240307.001".

Next, a genrule will read version.txt and embed the release candidate
name inside the Widevine CDM binary.

See also:
- go/wv-trunk "Versioning"
- cl/616721723

Bug: 327241925
Test: Coastguard
Change-Id: I892ee957c058ac5f624912a38a048781af5f3487

libwvdrmengine/Android.bp

@@ -387,21 +387,24 @@ python_binary_host {
 
 genrule {
     name: "wv_android_build_id",
+    srcs: ["version.txt"],
     tools: ["wv-android-genrule"],
-    cmd: "$(location wv-android-genrule) build_id_header > $(out)",
+    cmd: "$(location wv-android-genrule) build_id_header $(in) > $(out)",
     out: ["wv_android_build_id.h"],
 }
 
 genrule {
     name: "widevine_apex_manifest.json",
+    srcs: ["version.txt"],
     tools: ["wv-android-genrule"],
-    cmd: "$(location wv-android-genrule) apex_manifest > $(out)",
+    cmd: "$(location wv-android-genrule) apex_manifest $(in) > $(out)",
     out: ["gen_wv_apex_manifest.json"],
 }
 
 genrule {
     name: "widevine_lazy_apex_manifest.json",
+    srcs: ["version.txt"],
     tools: ["wv-android-genrule"],
-    cmd: "$(location wv-android-genrule) apex_manifest --name com.google.android.widevine.lazy > $(out)",
+    cmd: "$(location wv-android-genrule) apex_manifest --name com.google.android.widevine.lazy $(in) > $(out)",
     out: ["gen_wv_lazy_apex_manifest.json"],
 }