Factor out the code for determining output target name

into generator.determine-target-name function, so that
it can be easily reused.


[SVN r36604]

tools/build

@@ -1 +1 @@
-Subproject commit 6f4e5f0e73a803f9a615c72d46fd079507f8a9c5
+Subproject commit 0b49becd28585f2317e19fe60428396f22bd993c