Disable non-POSIX scheduling policies if not supported

samples/sample_common/src/vm/thread_linux.cpp:257:16: error: use of undeclared identifier 'SCHED_BATCH'
        type = SCHED_BATCH;
               ^
samples/sample_common/src/vm/thread_linux.cpp:260:16: error: use of undeclared identifier 'SCHED_IDLE'
        type = SCHED_IDLE;
               ^

--- samples/sample_common/src/vm/thread_linux.cpp.orig	2019-10-30 19:56:10 UTC
+++ samples/sample_common/src/vm/thread_linux.cpp
@@ -253,15 +253,21 @@ mfxStatus msdk_thread_get_schedtype(const msdk_char* s
     else if (!msdk_strcmp(str, MSDK_STRING("other"))) {
         type = SCHED_OTHER;
     }
+#ifdef SCHED_BATCH
     else if (!msdk_strcmp(str, MSDK_STRING("batch"))) {
         type = SCHED_BATCH;
     }
+#endif
+#ifdef SCHED_IDLE
     else if (!msdk_strcmp(str, MSDK_STRING("idle"))) {
         type = SCHED_IDLE;
     }
+#endif
+//#ifdef SCHED_DEADLINE
 //    else if (!msdk_strcmp(str, MSDK_STRING("deadline"))) {
 //        type = SCHED_DEADLINE;
 //    }
+//#endif
     else {
         return MFX_ERR_UNSUPPORTED;
     }