boost: Pass CFLAGS, CXXFLAGS and LDFLAGS correctly into boost.build
The compileflags and linkflags do_boostconfig puts into user-config.jam are
having no effect. According to
http://www.boost.org/boost-build2/doc/html/bbv2/reference/tools.html the
correct syntax would be <compileflags>"the flags" <linkflags>"the flags".
Since the flags specified were having no effect they can't be necessary and
can be safely removed. We should be passing ${CFLAGS}, ${CXXFLAGS} and
${LDFLAGS} instead so that users of the recipe can pass arbitrary flags as
they choose.
Signed-off-by: Mike Crowe <mac@mcrowe.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
