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

Backport-of: 9a87e2134ef531a6906454186517d3eee2e487c2

Author: reinrich

src/hotspot/os_cpu/linux_ppc/javaThread_linux_ppc.cpp

@@ -25,6 +25,7 @@
 
 #include "precompiled.hpp"
 #include "memory/metaspace.hpp"
+#include "os_linux.hpp"
 #include "runtime/frame.inline.hpp"
 #include "runtime/javaThread.hpp"