The patch remove duplicate reference to lib/libcurl.la to make it
possible to override the values during make. src/Makefile.am uses
similar code. I think I'll need this to create test that link against
libcurl.framework.

Notes: using lib_LDADD or test_LDADD cause automake to complain (I
did not understand why), so I used LDADD.

Best Regards,

Nir Soffer