Install Pageant from unix/Makefile.gtk

I use the Automake system myself, but the older Makefile.gtk system
might as well be kept up to date if it's still available.

Recipe

@@ -156,6 +156,7 @@ CFLAGS += /DHAS_GSSAPI
 !begin gtk
 install:
 	mkdir -p $(DESTDIR)$(bindir) $(DESTDIR)$(man1dir)
+	$(INSTALL_PROGRAM) -m 755 pageant $(DESTDIR)$(bindir)/pageant
 	$(INSTALL_PROGRAM) -m 755 plink $(DESTDIR)$(bindir)/plink
 	$(INSTALL_PROGRAM) -m 755 pscp $(DESTDIR)$(bindir)/pscp
 	$(INSTALL_PROGRAM) -m 755 psftp $(DESTDIR)$(bindir)/psftp
@@ -170,6 +171,7 @@ install:
 	$(INSTALL_PROGRAM) -m 755 putty $(DESTDIR)$(bindir)/putty
 	$(INSTALL_PROGRAM) -m 755 puttygen $(DESTDIR)$(bindir)/puttygen
 	$(INSTALL_PROGRAM) -m 755 puttytel $(DESTDIR)$(bindir)/puttytel
+	$(INSTALL_DATA) -m 644 ../doc/pageant.1 $(DESTDIR)$(man1dir)/pageant.1
 	$(INSTALL_DATA) -m 644 ../doc/plink.1 $(DESTDIR)$(man1dir)/plink.1
 	$(INSTALL_DATA) -m 644 ../doc/pscp.1 $(DESTDIR)$(man1dir)/pscp.1
 	$(INSTALL_DATA) -m 644 ../doc/psftp.1 $(DESTDIR)$(man1dir)/psftp.1