Add support for building the grammar in Windows, now that there is yyacc.c program.
Attempt to fix the build of MSVC and VC7 with the location of the kernel32.lib.
[SVN r16368]
* build.bat; accept all toolsets.
*build.bat; set toolset root when known.
* build.jam; accept --toolset-root=* for setting where the toolset lives.
* build.jam; don't clean grammar intermediates.
[SVN r16220]
More generic boost-jam.spec.
Addition of "--debug" option for building debug-profile versions of binaries.
More optimization flags for toolsets.
Prefer yacc instead of bison.
Bootstrap the yacc grammar in build.sh not just the grammar source.
buils.sh now also supports pass-thru arguments.
Simpler+faster checking for executables in PATH, buils.sh.
Use of "--toolset=<name>" instead of longer variable.
[SVN r16140]
build.bat: Windows NT BATCH bootstrap script.
build.sh: Unix shell bootstrap script.
build.jam: b/jam standalone Jamfile for building and distribution creation.
boost-jam.spec: modifications to conform to RedHat names/versioning and using new ./build.sh.
[SVN r16085]
