Another try at this commit.

With gcc-4.5.2, the stuct option defined in option.h

conflicts with an identically named struct in the gcc 
headers.  Renamed the bjam struct to bjam_option in all
places where referenced.



[SVN r68730]

tools/build

@@ -1 +1 @@
-Subproject commit e144c5ed0aed33630b4efc1d59a2f12c1c1f16a4
+Subproject commit 62d1e7cc112c02dda6b63fef3d2a884eefef072c