-[GSUnicodeString intValue] fix

[Larry Campbell]

-[GSUnicodeString intValue] fails if the input string is ten digits 
long (which is a legitimate input length). I found the problem in 
gnustep-base 1.4.0 and it still exists in 1.6.0.

Here's the fix:

--- GSString.m.broken   Fri Jun 20 13:39:35 2003
+++ GSString.m  Fri Jun 20 13:40:17 2003
@@ -1107,7 +1107,7 @@
     }
   else
     {
-      unsigned int     l = self->_count < 10 ? self->_count : 9;
+      unsigned int     l = self->_count < 11 ? self->_count : 10;
       unsigned char    buf[l+1];
       unsigned char    *b = buf;