waf: fix lib link check

-llibrary_name is already part of the link flags at this point and
libname is "liblibrary_name" so it adds -lliblibrary_name instead which
is wrong

Tools/ardupilotwaf/cxx_checks.py

@@ -186,7 +186,6 @@ def check_package(cfg, env, libname):
             fragment='''int main() { return 0; }''',
             msg='Checking link with %s' % libname,
             mandatory=False,
-            lib=libname,
             use=capsname):
         cfg.env.revert()
         return False