Add Android cross-compilation support to top-level Makefile

src/platform-linux.cc

Index: src/platform-linux.cc
diff --git a/src/platform-linux.cc b/src/platform-linux.cc
index a3cdc031ef1a5a820512cca804a754bb18688d43..8769425ead27cfc554df905f0dd33892f3fda047 100644
--- a/src/platform-linux.cc
+++ b/src/platform-linux.cc
@@ -1151,6 +1151,9 @@ class SignalSender : public Thread {
     // occuring during signal delivery.
     useconds_t interval = interval_ * 1000 - 100;
     if (full_or_half == HALF_INTERVAL) interval /= 2;
+#if defined(ANDROID)
+    usleep(interval);
+#else
     int result = usleep(interval);
 #ifdef DEBUG
     if (result != 0 && errno != EINTR) {
@@ -1160,8 +1163,9 @@ class SignalSender : public Thread {
               errno);
       ASSERT(result == 0 || errno == EINTR);
     }
-#endif
+#endif  // DEBUG
     USE(result);
+#endif  // ANDROID
   }
 
   const int vm_tgid_;