330340 fix BeOS build: don't define THREADSAFE - it's not needed

r=tqh,brettw patch by Doug Shelton <doug@sheltonfamily.org>

db/sqlite3/src/Makefile.in

@@ -96,7 +96,7 @@ CSRCS = \
 	$(NULL)
 
 # REFEF_IO allows us to override IO functions, which is used in the AsyncIO
-DEFINES = -DSQLITE_ENABLE_REDEF_IO -DTHREADSAFE=1
+DEFINES = -DSQLITE_ENABLE_REDEF_IO
 
 # -DSQLITE_SECURE_DELETE=1 will cause SQLITE to 0-fill delete data so we
 # don't have to vacuum to make sure the data is not visible in the file.