Ticket #48109 - substring index with nssubstrbegin: 1 is not being used with filters like (attr=x*)

Description: commit ae69e4aa1dcec1c5f79af502b77d9e19a3d348ee introduced
an jenkins error:
------------------------------------------------------------
ldap/servers/slapd/plugin_syntax.c:911:2: warning: implicit declaration of
function 'slapi_attr_assertion2keys_sub_sv_pb' [-Wimplicit-function-declaration]
ldap/servers/slapd/back-ldbm/filterindex.c:956:5: warning: implicit declaration
of function 'slapi_attr_assertion2keys_sub_sv_pb' [-Wimplicit-function-declaration]
------------------------------------------------------------
Added a missing function declaration slapi_attr_assertion2keys_sub_sv_pb
to slapi-plugin.h.

ldap/servers/slapd/slapi-plugin.h

@@ -5860,6 +5860,8 @@ int slapi_attr_assertion2keys_ava_sv( const Slapi_Attr *sattr, Slapi_Value *val,
 	Slapi_Value ***ivals, int ftype );
 int slapi_attr_assertion2keys_sub_sv( const Slapi_Attr *sattr, char *initial,
 	char **any, char *final, Slapi_Value ***ivals );
+int slapi_attr_assertion2keys_sub_sv_pb( Slapi_PBlock *pb, const Slapi_Attr *sattr,
+	char *initial, char **any, char *final, Slapi_Value ***ivals);
 
 /**
  * Normalize the given value using the syntax associated with the