setup.py: Add 'mercurial' as include dir for the inotify compiler.
This patch adds access to util.h for the inotify C module by adding the
"mercurial" directory as an include dir, enabling access to the macros defined
in util.h.
#!/bin/sh
hg init
cat > a <<EOF
a
b
c
EOF
hg ci -Am adda
cat > a <<EOF
d
e
f
EOF
hg ci -m moda
hg diff --reverse -r0 -r1
cat >> a <<EOF
g
h
EOF
hg diff --reverse --nodates