[libpeas] Add a demo rule to the toplevel Makefile.am

[Steve Frécinaux <sfre src gnome org>]

commit 2ea916d6931e7576aadab498af65fd9033771c6b
Author: Garrett Regier <alias301 gmail com>
Date:   Sun Jan 16 18:31:39 2011 -0800

    Add a demo rule to the toplevel Makefile.am
    
    Such a rule already existed in peas-demo/Makefile.am

 Makefile.am |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index e02ffb5..b69b8f9 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -27,4 +27,7 @@ dist-hook:
 test test-gdb test-valgrind test-report perf-report full-report: all
 	@cd tests && $(MAKE) $(AM_MAKEFLAGS) $(@)
 
-.PHONY: all test test-gdb test-report perf-report full-report
+demo: all
+	@cd peas-demo && $(MAKE) $(AM_MAKEFLAGS) $(@)
+
+.PHONY: all test test-gdb test-report perf-report full-report demo