Allow 64 concurrent emulators to run easily.

This increases the threshold from 16 to 64.

Note that a similar change is needed to let the ADB server
see more than 16 existing emulator instances when it starts
after them.

Change-Id: I61b9ebd7241764c479c3d2571f79499be17443d6
diff --git a/android/qemu-setup.c b/android/qemu-setup.c
index 4765f31..d728898 100644
--- a/android/qemu-setup.c
+++ b/android/qemu-setup.c
@@ -226,7 +226,7 @@
  */
 void  android_emulation_setup( void )
 {
-    int   tries     = 16;
+    int   tries     = MAX_ANDROID_EMULATORS;
     int   base_port = 5554;
     int   adb_host_port = 5037; // adb's default
     int   success   = 0;