BaseTools/PatchCheck.py: Update for max length of subject and message line
BaseTools/PatchCheck.py: Update for max length of subject and message line

This patch update PatchCheck.py:
1. The subject line of the commit message should be < 72 characters.
2. The other lines of the commit message should be < 76 characters.

Fixes: https://bugzilla.tianocore.org/show_bug.cgi?id=113
Cc: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>
Cc: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Reviewed-by: Jordan Justen <a79006884ba9cf5f4f7fcbb92a15b208780d8c97@intel.com>

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