bootstrap: chdir to bootstrap's directory

When integrating ninja into luvit I naively tried calling:

    ./tools/ninja/bootstrap.py

This broke because bootstrap expects you to be in the ninja directory
when you call it. This patch makes it possible to run bootstrap.py like
above and have it work.

1 files changed, 2 insertions, 0 deletions

diff --git a/bootstrap.py b/bootstrap.py
index ad6f1eb..f178bda 100755
--- a/bootstrap.py
+++ b/bootstrap.py
@@ -21,6 +21,8 @@ import errno
 import shlex
 import subprocess
 
+os.chdir(os.path.dirname(sys.argv[0]))
+
 parser = OptionParser()
 parser.add_option('--verbose', action='store_true',
                   help='enable verbose build',)