linux-user: move ppc socket.h definitions to ppc/sockbits.h

Change conditional #ifdef part by #undef of the symbols
redefined for PPC relative to generic/socket.h
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Message-Id: <20180519092956.15134-6-laurent@vivier.eu>

linux-user/generic/sockbits.h

@@ -30,21 +30,12 @@
 #define TARGET_SO_LINGER       13
 #define TARGET_SO_BSDCOMPAT    14
 /* To add :#define TARGET_SO_REUSEPORT 15 */
-#if defined(TARGET_PPC)
-#define TARGET_SO_RCVLOWAT     16
-#define TARGET_SO_SNDLOWAT     17
-#define TARGET_SO_RCVTIMEO     18
-#define TARGET_SO_SNDTIMEO     19
-#define TARGET_SO_PASSCRED     20
-#define TARGET_SO_PEERCRED     21
-#else
 #define TARGET_SO_PASSCRED     16
 #define TARGET_SO_PEERCRED     17
 #define TARGET_SO_RCVLOWAT     18
 #define TARGET_SO_SNDLOWAT     19
 #define TARGET_SO_RCVTIMEO     20
 #define TARGET_SO_SNDTIMEO     21
-#endif
 
 /* Security levels - as per NRL IPv6 - don't actually do anything */
 #define TARGET_SO_SECURITY_AUTHENTICATION              22

linux-user/ppc/sockbits.h

+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation, or (at your option) any
+ * later version. See the COPYING file in the top-level directory.
+ */
+
+#ifndef PPC_SOCKBITS_H
+#define PPC_SOCKBITS_H
+
 #include "../generic/sockbits.h"
+
+#undef  TARGET_SO_RCVLOWAT
+#define TARGET_SO_RCVLOWAT     16
+#undef  TARGET_SO_SNDLOWAT
+#define TARGET_SO_SNDLOWAT     17
+#undef  TARGET_SO_RCVTIMEO
+#define TARGET_SO_RCVTIMEO     18
+#undef  TARGET_SO_SNDTIMEO
+#define TARGET_SO_SNDTIMEO     19
+#undef  TARGET_SO_PASSCRED
+#define TARGET_SO_PASSCRED     20
+#undef  TARGET_SO_PEERCRED
+#define TARGET_SO_PEERCRED     21
+
+#endif