LIBVPX_TEST_DATA_PATH -> LIBAOM_TEST_DATA_PATH

This commit renames LIBVPX_TEST_DATA_PATH to LIBAOM_TEST_DATA_PATH,
with a work around for working with jenkins environmnet variables.

Change-Id: If664ce57e25ad2af8121d1b578bf64043f0baa2a
diff --git a/test/video_source.h b/test/video_source.h
index db79308..e986ffb 100644
--- a/test/video_source.h
+++ b/test/video_source.h
@@ -25,22 +25,22 @@
 
 namespace libaom_test {
 
-// Helper macros to ensure LIBVPX_TEST_DATA_PATH is a quoted string.
+// Helper macros to ensure LIBAOM_TEST_DATA_PATH is a quoted string.
 // These are undefined right below GetDataPath
-// NOTE: LIBVPX_TEST_DATA_PATH MUST NOT be a quoted string before
+// NOTE: LIBAOM_TEST_DATA_PATH MUST NOT be a quoted string before
 // Stringification or the GetDataPath will fail at runtime
 #define TO_STRING(S) #S
 #define STRINGIFY(S) TO_STRING(S)
 
 // A simple function to encapsulate cross platform retrieval of test data path
 static std::string GetDataPath() {
-  const char *const data_path = getenv("LIBVPX_TEST_DATA_PATH");
+  const char *const data_path = getenv("LIBAOM_TEST_DATA_PATH");
   if (data_path == NULL) {
-#ifdef LIBVPX_TEST_DATA_PATH
+#ifdef LIBAOM_TEST_DATA_PATH
     // In some environments, we cannot set environment variables
     // Instead, we set the data path by using a preprocessor symbol
     // which can be set from make files
-    return STRINGIFY(LIBVPX_TEST_DATA_PATH);
+    return STRINGIFY(LIBAOM_TEST_DATA_PATH);
 #else
     return ".";
 #endif