broadway: remove unused libcrypt

eb1ab0dac2 removed support for authentication
based on crypt()-hashed passwords but it didn't remove the header.

Finish up with the removal.

This allows the broadway backend to build on FreeBSD (which has no
crypt.h).

https://bugzilla.gnome.org/show_bug.cgi?id=726149

gdk/broadway/Makefile.am

@@ -89,9 +89,9 @@ broadwayd_SOURCES = \
 	broadway-output.c
 
 if OS_WIN32
-broadwayd_LDADD = $(GDK_DEP_LIBS) -lcrypt -lws2_32
+broadwayd_LDADD = $(GDK_DEP_LIBS) -lws2_32
 else
-broadwayd_LDADD = $(GDK_DEP_LIBS) -lrt -lcrypt
+broadwayd_LDADD = $(GDK_DEP_LIBS) -lrt
 endif
 
 MAINTAINERCLEANFILES = $(broadway_built_sources)

gdk/broadway/broadway-server.c

@@ -4,8 +4,6 @@
 
 #include "broadway-output.h"
 
-#define _XOPEN_SOURCE /* for crypt */
-
 #include <glib.h>
 #include <glib/gprintf.h>
 #include "gdktypes.h"
@@ -18,7 +16,6 @@
 #elif defined (G_OS_WIN32)
 #include <io.h>
 #endif
-#include <crypt.h>
 #ifdef HAVE_SYS_MMAN_H
 #include <sys/mman.h>
 #endif