Reverted a change that breaks "automake".

configure.in:
  Do not use two-level entries like "sql/share", as "automake" fails on them.

configure.in

@@ -2446,7 +2446,7 @@ thread_dirs=
 
 dnl This probably should be cleaned up more - for now the threaded
 dnl client is just using plain-old libs.
-sql_client_dirs="strings regex mysys sql/share libmysql client"
+sql_client_dirs="strings regex mysys libmysql client"
 linked_client_targets="linked_libmysql_sources"
 
 if test "$THREAD_SAFE_CLIENT" != "no"