Fix path creation for zip file names in current folder.

When building in the current tree (i.e. buildfolder ending up as '.') creating
the filename to use in the zip file stripped all '.' characters. Use a
different way to create the filename to avoid this.

Change-Id: I139c404d5e83a8bcb028a9a22b125f238911e405
diff --git a/utils/common/deploy.py b/utils/common/deploy.py
index 24163d2..f57447a 100755
--- a/utils/common/deploy.py
+++ b/utils/common/deploy.py
@@ -354,11 +354,7 @@
     for root, dirs, files in os.walk(outfolder):
         for name in files:
             physname = os.path.normpath(os.path.join(root, name))
-            filename = string.replace(physname, os.path.normpath(buildfolder), "")
-            zf.write(physname, filename)
-        for name in dirs:
-            physname = os.path.normpath(os.path.join(root, name))
-            filename = string.replace(physname, os.path.normpath(buildfolder), "")
+            filename = os.path.relpath(physname, buildfolder)
             zf.write(physname, filename)
     zf.close()
     # remove output folder