Remove the emplace_hint implementation for unique containers as it isn't really used and seems to be causing sun 5.7 problems.

[SVN r56363]

libs/unordered

@@ -1 +1 @@
-Subproject commit f76af2d0c88b5426f1d1d599897537810441a7c4
+Subproject commit 437a35feaa6f8a719229f29822d7a9f00ebb26ff