RFE: Add -p to the diff options to provide more context in commit mails

[Chuck Ebbert <cebbert redhat com>]

This trivial patch adds more context to the diffs in commit mails:

--- CVSROOT.orig/syncmail
+++ CVSROOT/syncmail
@@ -147,7 +147,7 @@ def calculate_diff(filespec):
         brief = ""
         if optNoDiff:
             brief = "--brief"
-        diffcmd = '/usr/bin/cvs -f diff %s -kk -u -N -r %s -r %s %s' % (
+        diffcmd = '/usr/bin/cvs -f diff %s -kk -u -p -N -r %s -r %s %s' % (
             brief,
             oldrev, newrev, file)
         fp = os.popen(diffcmd)