HostStubGen: Write verbose/debug log to a file

See below for the log filename.

Also disable an unimplemented flag.

Bug: 311174191
Test: ./scripts/run-all-tests.sh
Test: m framework-minus-apex.ravenwood
    and examine console output and
    out/soong/.intermediates/frameworks/base/framework-minus-apex.ravenwood-base/android_common/gen/hoststubgen_framework-minus-apex.log
Change-Id: I9997370c93e2fe90276d5f3e657d45d440ca0a59
diff --git a/Ravenwood.bp b/Ravenwood.bp
index ca73378..68095d4 100644
--- a/Ravenwood.bp
+++ b/Ravenwood.bp
@@ -32,6 +32,8 @@
     cmd: "$(location hoststubgen) " +
         "@$(location ravenwood/ravenwood-standard-options.txt) " +
 
+        "--debug-log $(location hoststubgen_framework-minus-apex.log) " +
+
         "--out-impl-jar $(location ravenwood.jar) " +
 
         "--gen-keep-all-file $(location hoststubgen_keep_all.txt) " +
@@ -52,6 +54,8 @@
         // Following files are created just as FYI.
         "hoststubgen_keep_all.txt",
         "hoststubgen_dump.txt",
+
+        "hoststubgen_framework-minus-apex.log",
     ],
     visibility: ["//visibility:private"],
 }