Fix namespace collision with libz

Index: src/db_native.c
--- src/db_native.c.orig
+++ src/db_native.c
@@ -1601,7 +1601,7 @@ long    DB_ReadWordData_Native(sw_off_t wordID, unsign
 
     *worddata = buf = WORDDATA_Get(DB->worddata,wordID,data_size);
     /* Get saved_bytes and adjust data_size */
-    *saved_bytes = uncompress2(&buf);
+    *saved_bytes = swish_uncompress2(&buf);
     *data_size -= (buf - (*worddata));
     /* Remove saved_bytes from buffer
     ** We need to use memmove because data overlaps */