bootstrap failure with colons in objdir

[Benjamin Kosnik]

> 367 ${target_builddir}/c++config.h: ${glibcpp_builddir}/config.h \
> 368                                ${glibcpp_srcdir}/include/bits/c++config \
> 369                                ${target_builddir}

So if you quote all this stuff, will it work?

ie:

> 367 "${target_builddir}"/c++config.h: "${glibcpp_builddir}"/config.h \
> 368                                "${glibcpp_srcdir}"/include/bits/c++config \
> 369                                "${target_builddir}"

can you try please?