Config: remove solaris specific found_libucb

This is pollution from the hints file only, storing
the errorlevel if libucb was not found.

Author: Reini Urban

ext/Config/Config_xs.in

@@ -969,7 +969,6 @@ fflushall,		T_INV,0,ALN64I"@@fflushall@@"
 find,			T_INV,0,ALN64I"@@find@@"
 firstmakefile,		T_INV,0,ALN64I"@@firstmakefile@@"
 flex,			T_INV,0,ALN64I"@@flex@@"
-found_libucb,		T_INV,0,ALN64I"@@found_libucb@@"
 fpossize,		T_INV,0,ALN64I"@@fpossize@@"
 fpostype,		T_INV,0,ALN64I"@@fpostype@@"
 freetype,		T_INV,0,ALN64I"@@freetype@@"

hints/solaris_2.sh

@@ -171,6 +171,8 @@ END
 ;;
 esac
 
+unset found_libucb
+
 # Use shell built-in 'type' command instead of /usr/bin/which to
 # avoid possible csh start-up problems and also to use the same shell
 # we'll be using to Configure and make perl.