builtin.jam conditional <name> patch

From: brian riis (brian_at_[hidden])
Date: 2005-09-21 18:52:10

This patch saves me from the trouble I've been having recently with 
prebuilt static libraries.
The lib rule did not correctly recognize that a <name> might be 
conditional, as in:

lib somelib : : <variant>debug:<name>somelib-sd 
<variant>:release<name>somelib-s ;

Attached patch solves this.

--
/Brian
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