msi: ready_media_for_file fix

[Aric Stewart]

	use SOURCEDIR instead of PackagePath. Because the PackagePath may be local,
	while SOURCEDIR is more proper and will be a full directory.

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Index: dlls/msi/files.c
===================================================================
RCS file: /home/wine/wine/dlls/msi/files.c,v
retrieving revision 1.9
diff -u -r1.9 files.c
--- dlls/msi/files.c	13 Jul 2005 12:07:41 -0000	1.9
+++ dlls/msi/files.c	20 Jul 2005 15:26:27 -0000
@@ -534,8 +534,7 @@
             last_path = strdupW(source);
             *(strrchrW(last_path,'\\')+1)=0;
 
-            path = strdupW(package->PackagePath);
-            *strrchrW(path,'\\')=0;
+            path = load_dynamic_property(package,cszSourceDir,NULL);
 
             MsiSourceListAddMediaDiskW(package->ProductCode, NULL, 
                 MSIINSTALLCONTEXT_USERMANAGED, MSICODE_PRODUCT, count,