Implement cygw32

Here, we use the generic window-system configuration system we just
implemented to support the w32 window-system in the mainline build
under Cygwin.  (Previously, the w32 window system could only be
compiled as part of the NT-native Emacs build process.)

The changes in this patch need to be applied atomically in order to
avoid breaking Emacs.  The changes include:

  - Changes throughout the Lisp and C code to not assume that
      NT Emacs and the w32 window system are synonymous.

  - Wiring up the regular select(2) event loop to Windows messages

  - Cleaning up the w32 drag-and-drop receiving code.

  - Exposing Cygwin path conversion functions to elisp.

  - Unicode file dialog support when compiling for Cygwin.

  - Splitting the w32 term lisp initialization code into code
    applicable to any w32 window-system and code specific to
    system-type windows-nt.

  - Integrating the old and new w32 code into the build system.

1 files changed, 6 insertions, 11 deletions

diff --git a/src/w32.h b/src/w32.h
index 73d57a65a4..b83b716b61 100644
--- a/src/w32.h
+++ b/src/w32.h
@@ -19,6 +19,12 @@ GNU General Public License for more details.
 You should have received a copy of the GNU General Public License
 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#ifdef CYGWIN
+#error "w32.h is not compatible with Cygwin"
+#endif
+
+#include <windows.h>
+
 
 /* File descriptor set emulation.  */
 
@@ -130,17 +136,6 @@ extern LPBYTE w32_get_resource (char * key, LPDWORD type);
 extern void init_ntproc (void);
 extern void term_ntproc (void);
 extern void globals_of_w32 (void);
-extern void syms_of_w32term (void);
-extern void syms_of_w32fns (void);
-extern void globals_of_w32fns (void);
-extern void syms_of_w32select (void);
-extern void globals_of_w32select (void);
-extern void term_w32select (void);
-extern void syms_of_w32menu (void);
-extern void globals_of_w32menu (void);
-extern void syms_of_fontset (void);
-extern void syms_of_w32font (void);
-extern void check_windows_init_file (void);
 
 extern int _sys_read_ahead (int fd);
 extern int _sys_wait_accept (int fd);