Keeping ‘-B’ link flags

[Ludovic Courtès]

Hello,

In ‘link’ mode ‘libtool’ swallows GCC ‘-B’ arguments.  How can it be
worked around?  Using $GCC_EXEC_PREFIX doesn’t help because it’s too
coarse-grain.

(The goal here is to build a shared library with a bare metal cross-gcc,
and then allow it to link against crti.o & co. from the libc built with
that cross-compiler, hence the need for -B/path/to/cross/libc.)

Thanks,
Ludo’.