[CMake] CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA file permissions.

[Rick McGuire]

We're running into a problem with our Debian packaging.  We're using the
CPACK_DEBIAN_PACKAGE_CONTROL_EXTRA setting to configure postinst and prerm
scripts for the package.  The scrips come from our svn source tree and are
keeping the fairly open permissions from the checkout.  The ubuntu
installer is throwing an error because it expects these files to have more
restrictive permissions of 0644.  How can we get these files to the correct
permissions when the package is built?

Rick
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