Disable non-POSIX scheduling policies if not supported

tools/legacy/sample_common/src/vm/thread_linux.cpp:279:16: error: use of undeclared identifier 'SCHED_BATCH'
        type = SCHED_BATCH;
               ^
tools/legacy/sample_common/src/vm/thread_linux.cpp:282:16: error: use of undeclared identifier 'SCHED_IDLE'
        type = SCHED_IDLE;
               ^

--- tools/legacy/sample_common/src/vm/thread_linux.cpp.orig	2021-09-13 22:51:02 UTC
+++ tools/legacy/sample_common/src/vm/thread_linux.cpp
@@ -275,15 +275,21 @@ 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;
     }