broken dependency_libs handling of -pthread

[Joerg Sonnenberger]

Hi,
libtool-1.5.18 doesn't include -pthread in the dependency_libs
field of the .la file. This leads to link errors on DragonFly,
when linking against that library. Typical example is
ligthread from glib, which is a dependency of libORBit-2.
orbit-name-server-2 is linked against libORBit-2, but without
explicit -pthread. This fails with missing symbols.

The attached patch illustrates a possible workaround, but doesn't
apply to -pthread.

Joerg

patch-ac
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