Move the SSH implementation into its own subdirectory.

This clears up another large pile of clutter at the top level, and in
the process, allows me to rename source files to things that don't all
have that annoying 'ssh' prefix at the top.

windows/CMakeLists.txt

@@ -111,7 +111,7 @@ add_executable(psocks
   ${CMAKE_SOURCE_DIR}/psocks.c
   ${CMAKE_SOURCE_DIR}/norand.c
   ${CMAKE_SOURCE_DIR}/nocproxy.c
-  ${CMAKE_SOURCE_DIR}/portfwd.c)
+  ${CMAKE_SOURCE_DIR}/ssh/portfwd.c)
 target_link_libraries(psocks
   eventloop console network utils
   ${platform_libraries})

windows/platform.h

@@ -121,7 +121,7 @@ static inline uintmax_t strtoumax(const char *nptr, char **endptr, int base)
 #define strnicmp strncasecmp
 #endif
 
-#define BROKEN_PIPE_ERROR_CODE ERROR_BROKEN_PIPE   /* used in sshshare.c */
+#define BROKEN_PIPE_ERROR_CODE ERROR_BROKEN_PIPE   /* used in ssh/sharing.c */
 
 /*
  * Dynamically linked functions. These come in two flavours:
@@ -261,7 +261,7 @@ void write_aclip(int clipboard, char *, int, bool);
  * couldn't write it if I wanted to, but I haven't bothered), so
  * it's a macro which always returns NULL. With any luck this will
  * cause the compiler to notice it can optimise away the
- * implementation of XDM-AUTHORIZATION-1 in x11fwd.c :-)
+ * implementation of XDM-AUTHORIZATION-1 in ssh/x11fwd.c :-)
  */
 #define sk_getxdmdata(socket, lenp) (NULL)
 

windows/wingss.c

@@ -6,9 +6,9 @@
 #define SECURITY_WIN32
 #include <security.h>
 
-#include "pgssapi.h"
-#include "sshgss.h"
-#include "sshgssc.h"
+#include "ssh/pgssapi.h"
+#include "ssh/gss.h"
+#include "ssh/gssc.h"
 
 #include "misc.h"