fix install of bin

'scons install' would not install the 'bin' directory
unless it already existed, but it is usually created
by the 'shebang' target. Add it explicitly if we're
going to end up creating it.

python/lsst/sconsUtils/scripts.py

@@ -190,6 +190,9 @@ def finish(defaultTargets=DEFAULT_TARGETS,
             for path in os.listdir("."):
                 if os.path.isdir(path) and not path.startswith("."):
                     subDirList.append(path)
+        if "bin.src" in subDirList and "shebang" in state.targets:
+            # shebang makes a directory that should be installed
+            subDirList += ["bin"]
         install = state.env.InstallLSST(state.env["prefix"],
                                         [subDir for subDir in subDirList],
                                         ignoreRegex=ignoreRegex)