Revert "adb: make benchmarks build on the host."

This reverts commit 80dd70d285ffe562f458d02dadb4c006885b0489.

Breaks the darwin build.

Change-Id: If95266c6fc027cf2a706f3c83dce7e50b762b8aa
diff --git a/adb/Android.bp b/adb/Android.bp
index ba72d99..00e98fe 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -213,7 +213,6 @@
 cc_benchmark {
     name: "adb_benchmark",
     defaults: ["adb_defaults"],
-    host_supported: true,
 
     srcs: ["transport_benchmark.cpp"],
     target: {
@@ -227,9 +226,6 @@
                 "libadb_host",
             ],
         },
-        darwin: {
-            enabled: false,
-        }
     },
 
     static_libs: [
diff --git a/adb/transport_benchmark.cpp b/adb/transport_benchmark.cpp
index 044c8ac..022808f 100644
--- a/adb/transport_benchmark.cpp
+++ b/adb/transport_benchmark.cpp
@@ -183,10 +183,8 @@
 ADB_CONNECTION_BENCHMARK(BM_Connection_Echo, ThreadPolicy::MainThread);
 
 int main(int argc, char** argv) {
-#if defined(__BIONIC__)
     // Set M_DECAY_TIME so that our allocations aren't immediately purged on free.
     mallopt(M_DECAY_TIME, 1);
-#endif
 
     android::base::SetMinimumLogSeverity(android::base::WARNING);
     adb_trace_init(argv);