Broadway: Allow Compilation on Windows/MSVC

-Don't include unistd.h unconditionally as it's not available in Visual
 Studio, but include io.h where necessary.
-Avoid C99isms, and use _chsize_s in place of ftruncate when unistd.h is
 not available (as in the case of Visual Studio)

gdk/broadway/broadway-server.c

@@ -12,7 +12,11 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#elif defined (G_OS_WIN32)
+#include <io.h>
+#endif
 #include <crypt.h>
 #ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
@@ -979,7 +983,7 @@ static gchar *
 generate_handshake_response_wsietf_v7 (const gchar *key)
 {
   gsize digest_len = 20;
-  guchar digest[digest_len];
+  guchar digest[20];
   GChecksum *checksum;
 
   checksum = g_checksum_new (G_CHECKSUM_SHA1);

gdk/broadway/gdkbroadway-server.c

@@ -18,7 +18,12 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#elif defined (G_OS_WIN32)
+#include <io.h>
+#define ftruncate _chsize_s
+#endif
 #include <sys/types.h>
 #ifdef G_OS_WIN32
 #include <windows.h>

gdk/broadway/gdkdisplay-broadway.c

@@ -37,7 +37,9 @@
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <sys/types.h>
 
 static void   gdk_broadway_display_dispose            (GObject            *object);

gdk/broadway/gdkkeys-broadway.c

@@ -33,7 +33,9 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#ifdef HAVE_UNISTD_H
 #include <unistd.h>
+#endif
 #include <limits.h>
 #include <errno.h>