dtterm: fix problem introduced with 0e9b1140ea, preventing install of dtterm

The tic command needs to be under the 'install-exec-hook:' target, not
the 'install:' target.  Specifying the 'install:' target overrides
everything else, causing the dtterm binary to not be installed on a
'make install'

cde/programs/dtterm/Makefile.am

@@ -47,13 +47,9 @@ dtterm.ti: terminfoChecklist
 	$(RM) $@
 	CPP="$(GENCPP)" $(SHELL) terminfoCreate < terminfoChecklist > $@
 
-
-install:
-	@TIC@ dtterm.ti
-
 install-exec-hook:
-	chown root $(DESTDIR)$(bindir)/dtterm
 if !HAS_UTEMPTER_LIBRARY
+	chown root $(DESTDIR)$(bindir)/dtterm
 	chmod 4755 $(DESTDIR)$(bindir)/dtterm
 endif
-
+	@TIC@ dtterm.ti