tools/examples: hardcode #!/usr/bin/python shebang
diff --git a/tools/offcputime.py b/tools/offcputime.py
index 6440260..d84ae52 100755
--- a/tools/offcputime.py
+++ b/tools/offcputime.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/python
 #
 # offcputime    Summarize off-CPU time by stack trace
 #               For Linux, uses BCC, eBPF.