waf_libbsd: Account for library check results

Conditionally compiled tests (consisting only of debugger01) were not
compiling as expected when libdebugger was present. This appears to have
occurred during the transition from header detection or due to an
intervening change in the waf internal libraries. The result of
check_cc() is the only location this information is reported, so library
checks now set HAVE_<LIBRARY> as appropriate when the library is found
so existing code for header configuration correctly recognize that a
library is present.

waf_libbsd.py

@@ -180,10 +180,11 @@ class Builder(builder.ModuleManager):
                                        mandatory=False)
                     elif configTest == 'library':
                         for l in self.data['configure'][configTest][cfg]:
-                            conf.check_cc(lib=l,
-                                          fragment=rtems.test_application(),
-                                          execute=False,
-                                          mandatory=False)
+                            if conf.check_cc(lib=l,
+                                             fragment=rtems.test_application(),
+                                             execute=False,
+                                             mandatory=False)
+                                conf.env['HAVE_%s' % l.upper()] = True
                     else:
                         bld.fatal('invalid config test: %s' % (configTest))
             section_flags = ["-fdata-sections", "-ffunction-sections"]