Add 'make install' target to build. It's "MRE-friendly". (See http://www.mozilla.org/projects/embedding/MRE.html for details.)

Changes:
* Added EXTRA_COMPONENTS variable to build.  Use it to automagically install files into the components dir.
* Added SYSINSTALL variable.  Use it install files onto the system.
* Move mozilla-config generation from configure to makefiles
* mozilla-config will now generate paths based upon the MRE-based directory layout.
* Generate mozilla script from template

The installation heirarchy currently looks like:
$prefix -> /bin/mozilla
           /bin/mozilla-config
           /include/mozilla-ver/*
           /lib/mozilla-ver  (mozappdir)
                            /components
                            /res
                            /defaults
                            /chrome

There is preliminary build support for MRE dirs as well though the component manager hasn't had MRE support added yet.

$prefix -> /lib/mre/mre-ver  (mredir)
                            /components


git-svn-id: svn://10.0.0.236/trunk@119809 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/modules/plugin/samples/default/unix/Makefile.in

@@ -64,4 +64,8 @@ endif
 
 libs:: install-plugin
 
+ifdef SHARED_LIBRARY
+install:: $(SHARED_LIBRARY)
+	$(SYSINSTALL) $(IFLAGS2) $< $(DESTDIR)$(mozappdir)/plugins 
+endif