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/net.cc

@@ -31,6 +31,7 @@ details. */
 #include "sync.h"
 #include "sigproc.h"
 #include "pinfo.h"
+#include "registry.h"
 
 /* We only want to initialize WinSock in a child process if socket
    handles are inheritted. This global allows us to know whether this
@@ -76,7 +77,6 @@ extern "C"
 unsigned long int
 htonl (unsigned long int x)
 {
-  MARK ();
   return ((((x & 0x000000ffU) << 24) |
 	   ((x & 0x0000ff00U) <<  8) |
 	   ((x & 0x00ff0000U) >>  8) |
@@ -96,7 +96,6 @@ extern "C"
 unsigned short
 htons (unsigned short x)
 {
-  MARK ();
   return ((((x & 0x000000ffU) << 8) |
 	   ((x & 0x0000ff00U) >> 8)));
 }