Move even more headers outside extern "C".

If a header declares a function, or anything else requiring the extern
"C" decoration, have it wrap the declaration itself; don't rely on the
header itself being included inside extern "C".

(cherry picked from commit e434d404d0)

wsutil/cpu_info.h

@@ -17,8 +17,6 @@
 extern "C" {
 #endif /* __cplusplus */
 
-#include "ws_symbol_export.h"
-
 WS_DLL_PUBLIC void get_cpu_info(GString *str);
 
 #ifdef __cplusplus

wsutil/file_util.h

@@ -17,10 +17,6 @@
 
 #include "ws_symbol_export.h"
 
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
-
 #ifdef _WIN32
 #include <io.h>		/* for _read(), _write(), etc. */
 #include <gmodule.h>
@@ -36,6 +32,12 @@ extern "C" {
 
 #include <sys/stat.h>	/* for stat() and struct stat */
 
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
 /* We set a larger IO Buffer size for the capture files */
 #define IO_BUF_SIZE (64 * 1024)
 
@@ -58,8 +60,6 @@ extern "C" {
 #define S_ISDIR(mode)   (((mode) & S_IFMT) == S_IFDIR)
 #endif
 
-#include <stdio.h>
-
 #ifdef _WIN32
 
 /*

wsutil/plugins.h

@@ -13,13 +13,13 @@
 
 #include <glib.h>
 
+#include <gmodule.h>
+#include "ws_symbol_export.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
-#include <gmodule.h>
-#include "ws_symbol_export.h"
-
 typedef void (*plugin_register_func)(void);
 
 typedef void plugins_t;

wsutil/processes.h

@@ -13,6 +13,20 @@
 
 #include "ws_symbol_export.h"
 
+#ifdef _WIN32
+/*
+ * On Windows, a process ID is a HANDLE.
+ * Include <windows.h> to make sure HANDLE is defined.
+ */
+#include <windows.h>
+#else
+/*
+ * On UN*X, a process ID is a pid_t.
+ * Include <sys/types.h> to make sure pid_t is defined.
+ */
+#include <sys/types.h>
+#endif
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
@@ -20,20 +34,15 @@ extern "C" {
 #ifdef _WIN32
 /*
  * On Windows, a process ID is a HANDLE.
- * Include <windows.h> to make sure HANDLE is defined.
  */
-#include <windows.h>
-
 typedef HANDLE ws_process_id;
 
 #define WS_INVALID_PID    INVALID_HANDLE_VALUE
+
 #else
 /*
  * On UN*X, a process ID is a pid_t.
- * Include <sys/types.h> to make sure pid_t is defined.
  */
-#include <sys/types.h>
-
 typedef pid_t ws_process_id;
 
 #define WS_INVALID_PID    -1

wsutil/time_util.h

@@ -12,12 +12,12 @@
 
 #include "ws_symbol_export.h"
 
+#include <time.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif /* __cplusplus */
 
-#include <time.h>
-
 WS_DLL_PUBLIC
 time_t mktime_utc(struct tm *tm);
 

wsutil/unicode-utils.h

@@ -15,6 +15,12 @@
 
 #include <glib.h>
 
+#ifdef _WIN32
+#include <windows.h>
+#include <tchar.h>
+#include <wchar.h>
+#endif
+
 /**
  * @file
  * Unicode convenience routines.
@@ -29,10 +35,6 @@ int ws_utf8_char_len(guint8 ch);
 
 #ifdef _WIN32
 
-#include <windows.h>
-#include <tchar.h>
-#include <wchar.h>
-
 /** Given a UTF-8 string, convert it to UTF-16.  This is meant to be used
  * to convert between GTK+ 2.x (UTF-8) to Windows (UTF-16).
  *