Make libqcomvisualizer build with the VNDK.

When the vndk is enabled (BOARD_VNDK_VERSION=current),
vendor libraries must only link against vendor variants
in the build system. This means that they receive restricted
sets of headers and that automatic global headers are restricted.

Test: build libqcomvisualizer with BOARD_VNDK_VERSION=current
Bug: 37342627
Change-Id: I7f17946754091ac3a71ccc6451429bb1cd60d13b
diff --git a/visualizer/offload_visualizer.c b/visualizer/offload_visualizer.c
index 4d1373f..ab269ff 100644
--- a/visualizer/offload_visualizer.c
+++ b/visualizer/offload_visualizer.c
@@ -17,12 +17,14 @@
 #define LOG_TAG "offload_visualizer"
 /*#define LOG_NDEBUG 0*/
 #include <assert.h>
+#include <dlfcn.h>
 #include <math.h>
+#include <pthread.h>
 #include <stdlib.h>
 #include <string.h>
-#include <time.h>
 #include <sys/prctl.h>
-#include <dlfcn.h>
+#include <time.h>
+#include <unistd.h>
 
 #include <cutils/list.h>
 #include <cutils/log.h>