[PATCH] vala: move GLibMainLoop class into separate file to fix linker errors

[kurtz.alex@xxxxxxxxxxxxxx (Alexander Kurtz)]

Hi,

Vala uses the name of the *.vapi file to determine the libraries to link
against. Since the pa_glib_mainloop_*() functions are in a separate
library (libpulse-mainloop-glib.so) the corresponding objects in the
Vala bindings have to be in a separate *.vapi file.

Otherwise using PA's GLib main loop with Vala fails with linker errors:

	$ cat test.vala
	class Foo : Object {
		PulseAudio.GLibMainLoop loop;
		static void main(){
		}
	}
	$ valac --vapidir=old/vala/ --pkg=libpulse test.vala 
	test.vala:2.2-2.29: warning: field `Foo.loop' never used
		PulseAudio.GLibMainLoop loop;
		^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	/tmp/cc61gzd9.o: In function `foo_finalize':
	test.vala.c:(.text+0x160): undefined reference to `pa_glib_mainloop_free'
	collect2: ld returned 1 exit status
	error: cc exited with status 256
	Compilation failed: 1 error(s), 1 warning(s)
	$ 

A workaround would be:

	$ valac --vapidir=old/vala/ --pkg=libpulse -Xcc -L/usr/lib/libpulse-mainloop-glib.so test.vala 
	test.vala:2.2-2.29: warning: field `Foo.loop' never used
		PulseAudio.GLibMainLoop loop;
		^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	Compilation succeeded - 1 warning(s)
	$ 

The attached patch fixes the issue for me:

	$ valac --vapidir=new/vala/ --pkg=libpulse --pkg=libpulse-mainloop-glib test.vala
	test.vala:2.2-2.29: warning: field `Foo.loop' never used
		PulseAudio.GLibMainLoop loop;
		^^^^^^^^^^^^^^^^^^^^^^^^^^^^
	Compilation succeeded - 1 warning(s)
	$ 

If you don't have any objections, please merge this patch into master.

Best regards

Alexander Kurtz
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