Darwin improvements.
Patch from Andre Hentz.
* v2/build/toolset.jam
(inherit-flags): Take an extra parameter describing properties that
should not be inherited.
* v2/build/type.jam
(register-suffixes): Removed local qualifier.
* v2/test/BoostBuild.py
(prepare_suffix_map): Add .dylib if OS is Darwin.
(Tester::_init_): path to bjam on Darwin.
* v2/test/prebuilt.py
make sure $toolset is expanded correctly.
* v2/test/prebuilt/project-root.jam
use $toolset instead of gcc.
* v2/test/prebuilt/ext/project-root.jam
use $toolset instead of gcc.
* v2/test/prebuilt/ext/Jamfile2.jam
handle extension .dylib.
* v2/test/prebuilt/ext/Jamfile2.jam
handle extension .dylib.
* v2/tools/darwin.jam
inline call to toolset.inherit.
filter <debug-symbols>off because -s is not accepted for dlls.
speficy that .dylib files are of type SHARED_LIB.
(actions link): pass -s for static linkage.
(actions link.dll): pass -L flag with path to libraries.
(actions archive): -c inhibits warning.
[SVN r22332]
Vladimir Prus