Ported ICU integration code to VC6/7.

Added some needed std lib #includes.
Reworked gcc separate file template instantiation code.


[SVN r30791]

libs/regex

@@ -1 +1 @@
-Subproject commit db5748ae7e33e81c4937104283d70aa95f079390
+Subproject commit 90f4367b8d8867a79dea2f8a5e3ea04eff82d9b8