* gnu-regex.c: Eliminate obsolete check for _MSC_VER.

* utils.c (notice_quit): Remove dummy function only used for _MSC_VER.
* values.c (unpack_double): Remove obsolete check for _MSC_VER.
* defs.h: Ditto.
* m32r-rom.c: Ditto.
* p-exp.y: Ditto.
* ser-e7kpc.c: Ditto.  Define WIN32_LEAN_AND_MEAN under _WIN32, for faster
compilation.
(get_ds_base): Remove _MSC_VER version of this function.
* nindy-share/ttyflush.c: Ditto.  X
* rdi-share/host.h: Ditto.  X
* ser-go32.c (dos_readchar): Remove call to obsolete function.
* remote-sim.c (gdb_os_poll_quit): Ditto.
* remote-e7000.c (expect): Remove obsolete #if 0'ed code.
* main.c (captured_main): Eliminate special Cygwin checks.
* ser-tcp.c: Remove unneeded __CYGWIN__ guard against system include.

gdb/main.c

@@ -90,10 +90,6 @@ static void print_gdb_help (struct ui_file *);
 extern int enable_external_editor;
 extern char *external_editor_command;
 
-#ifdef __CYGWIN__
-#include <sys/cygwin.h>		/* for cygwin32_conv_to_posix_path */
-#endif
-
 /* Call command_loop.  If it happens to return, pass that through as a
    non-zero return status. */
 
@@ -534,21 +530,7 @@ extern int gdbtk_test (char *);
      *before* all the command line arguments are processed; it sets
      global parameters, which are independent of what file you are
      debugging or what directory you are in.  */
-#ifdef __CYGWIN__
-  {
-    char *tmp = getenv ("HOME");
-
-    if (tmp != NULL)
-      {
-	homedir = (char *) alloca (PATH_MAX + 1);
-	cygwin32_conv_to_posix_path (tmp, homedir);
-      }
-    else
-      homedir = NULL;
-  }
-#else
   homedir = getenv ("HOME");
-#endif
   if (homedir)
     {
       homeinit = (char *) alloca (strlen (homedir) +