Changed syntax of 'using gcc', allowing configuration of linker-type
* v2/tools/gcc.jam
(init): parse the new options and call the new rule.
(init-link-flags): new rule. Initialize flags based on linker type.
put back -minpure-text
* v2/test/conditionals.py
small modification to avoid empty binaries.
Patch from Andre Hentz.
[SVN r25764]
Vladimir Prus