fix gitignore errors

.gitignore

@@ -15,6 +15,9 @@
 
 # Executables
 zstd
+!build/VS2008/zstd
+!build/VS2010/zstd
+!contrib/VS2005/zstd
 zstdmt
 *.exe
 *.out
@@ -23,6 +26,10 @@ zstdmt
 # Test artefacts
 tmp*
 dictionary*
+!examples/dictionary_compression.c
+!examples/dictionary_decompression.c
+!tests/fuzz/dictionary_decompress.c
+!tests/fuzz/dictionary_round_trip.c
 NUL
 
 # Build artefacts