8352800: [PPC] OpenJDK fails to build on PPC after JDK-8350106

Reviewed-by: rrich, shade

Author: Vladimir Petko

src/hotspot/os_cpu/linux_ppc/javaThread_linux_ppc.cpp

@@ -24,6 +24,7 @@
  */
 
 #include "memory/metaspace.hpp"
+#include "os_linux.hpp"
 #include "runtime/frame.inline.hpp"
 #include "runtime/javaThread.hpp"