MANIFEST - add new file

Added:
C/t/23validate.t
C/C.pm - Update version number to 0.53
Inline.pm - update version number to 0.53
lib/Inline/MakeMaker.pm - bump version to 0.53
lib/Inline/MakeMaker/Changes - Update
Changes - Update
C/Changes - Update
C/t/23validate.t - new test script for (ticket #11748)