fix parsing of filenames containing brackets

oops, missed part of a regexp in parse_token, see:

https://github.com/jcupitt/libvips/issues/395

thanks shilpi230

ChangeLog

@@ -1,5 +1,6 @@
 27/1/16 started 8.2.3
 - fix a crash with SPARC byte-order labq vips images
+- fix parsing of filenames containing brackets, thanks shilpi230
 
 12/1/16 started 8.2.2
 - changes to ease compiling C++ binding with MSVC [Lovell Fuller]

libvips/iofuncs/util.c

@@ -1228,7 +1228,7 @@ vips__token_get( const char *p, VipsToken *token, char *string, int size )
 		 * so the next break must be bracket, equals, comma.
 		 */
 		*token = VIPS_TOKEN_STRING;
-		n = strcspn( p, "<[{()}]>=," );
+		n = strcspn( p, "[]=," );
 		i = VIPS_MIN( n, size );
 		vips_strncpy( string, p, i + 1 );
 		p += n;