Initial support for the borland toolset.

* borland.jam: New file. Does not support dll yet.

* builtin.jam: Use "obj" and "lib" extensions on
    Windows for objects and static libraries, respectively.


[SVN r16441]

tools/build

@@ -1 +1 @@
-Subproject commit 0afa3aa911ef7a3d7a10bafa433d272a08ea7e81
+Subproject commit 48a19e3feb1a82b8ca604ba0e12b9ca2517aff1b