bzip2: expose tuning knob for faster/smaller code

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/archival/libarchive/bz/huffman.c b/archival/libarchive/bz/huffman.c
index be5930e..dc851cd 100644
--- a/archival/libarchive/bz/huffman.c
+++ b/archival/libarchive/bz/huffman.c
@@ -48,7 +48,7 @@
 
 
 /* 90 bytes, 0.3% of overall compress speed */
-#if CONFIG_BZIP2_FAST >= 1
+#if BZIP2_SPEED >= 1
 
 /* macro works better than inline (gcc 4.2.1) */
 #define DOWNHEAP1(heap, weight, Heap) \