Break out more header info into separate files. Use appropriate header files

throughout.
* shared.h: Remove.
* cygwin_version.h: New file.
* delqueue.h: New file.
* environ.h: New file.
* host_dependent.h: New file.
* perprocess.h: New file.
* registry.h: New file.
* security.h: New file.

winsup/cygwin/registry.h

@@ -0,0 +1,43 @@
+/* registry.h: shared info for cygwin
+
+   Copyright 2000 Cygnus Solutions.
+
+This file is part of Cygwin.
+
+This software is a copyrighted work licensed under the terms of the
+Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
+details. */
+
+class reg_key
+{
+private:
+
+  HKEY key;
+  LONG key_is_invalid;
+
+public:
+
+  reg_key (HKEY toplev, REGSAM access, ...);
+  reg_key (REGSAM access, ...);
+  reg_key (REGSAM access = KEY_ALL_ACCESS);
+
+  void *operator new (size_t, void *p) {return p;}
+  void build_reg (HKEY key, REGSAM access, va_list av);
+
+  int error () {return key == (HKEY) INVALID_HANDLE_VALUE;}
+
+  int kill (const char *child);
+  int killvalue (const char *name);
+
+  HKEY get_key ();
+  int get_int (const char *,int def);
+  int get_string (const char *, char *buf, size_t len, const char *def);
+  int set_string (const char *,const char *);
+  int set_int (const char *, int val);
+
+  ~reg_key ();
+};
+
+/* Evaluates path to the directory of the local user registry hive */
+char *__stdcall get_registry_hive_path (const PSID psid, char *path);
+void __stdcall load_registry_hive (PSID psid);