tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/examples/tracing/bitehist.py b/examples/tracing/bitehist.py
index 410424b..c8c7f7a 100755
--- a/examples/tracing/bitehist.py
+++ b/examples/tracing/bitehist.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 #
 # bitehist.py	Block I/O size histogram.
 #		For Linux, uses BCC, eBPF. Embedded C.