Copy android_manifest_merger from target configuration into host configuration.

--
MOS_MIGRATED_REVID=138004628

src/main/java/com/google/devtools/build/lib/rules/android/AndroidConfiguration.java

diff --git a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidConfiguration.java b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidConfiguration.java
index c3bffb5..c31245d 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidConfiguration.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidConfiguration.java
@@ -430,6 +430,7 @@
       host.incrementalDexingBinaries = incrementalDexingBinaries;
       host.nonIncrementalPerTargetDexopts = nonIncrementalPerTargetDexopts;
       host.dexoptsSupportedInIncrementalDexing = dexoptsSupportedInIncrementalDexing;
+      host.manifestMerger = manifestMerger;
       return host;
     }