Include <errno.h> for EBUSY

Change-Id: I9fa3417445866f3ce37af2169f623afa8e92e873

runtime/hsa-runtime/core/util/lnx/os_linux.cpp

@@ -52,6 +52,7 @@
 #include <sys/sysinfo.h>
 #include <sys/time.h>
 #include <unistd.h>
+#include <errno.h>
 
 namespace os {