#3 Weak symbols

[Gregory Nutt]

XFLAT wraps the uClibc libc and libpthread to provide
support in the XFLAT environment. In uClibc, there is
strong coupling between libc and libpthread view "weak"
symbols. XFLAT does not support weak symbols: A
symbol is either there or not.

At present, this resolved by requiring libpthread: libc
always has a dependency on libpthread and libpthread
must always be loaded.

If the XFLAT binary format and the XFLAT dynamic loader
(ld.so) support weak symbols, then this dependency
could be broken.