pppd: Remove promptpass plugin

This is prompted by a number of factors:

* The handling of privileges and possibly file descriptors is flawed

* In many cases there will be no terminal accessible to the prompter
  program at the point where the prompter is run

* The passwordfd plugin does much the same thing but does it more
  cleanly and securely.

Signed-off-by: Paul Mackerras <[email protected]>

pppd/plugins/Makefile.am

@@ -1,4 +1,4 @@
-pppd_plugin_LTLIBRARIES = minconn.la passprompt.la passwordfd.la winbind.la
+pppd_plugin_LTLIBRARIES = minconn.la passwordfd.la winbind.la
 pppd_plugindir = $(PPPD_PLUGIN_DIR)
 
 PLUGIN_CPPFLAGS = -I${top_srcdir}
@@ -8,10 +8,6 @@ minconn_la_CPPFLAGS = $(PLUGIN_CPPFLAGS)
 minconn_la_LDFLAGS = $(PLUGIN_LDFLAGS)
 minconn_la_SOURCES = minconn.c
 
-passprompt_la_CPPFLAGS = $(PLUGIN_CPPFLAGS)
-passprompt_la_LDFLAGS = $(PLUGIN_LDFLAGS)
-passprompt_la_SOURCES = passprompt.c
-
 passwordfd_la_CPPFLAGS = $(PLUGIN_CPPFLAGS)
 passwordfd_la_LDFLAGS = $(PLUGIN_LDFLAGS)
 passwordfd_la_SOURCES = passwordfd.c