Don't add executables to cmake exports

Don't add executables to cmake exports

Bug-Debian: https://bugs.debian.org/803304
Forwarded: not-needed

CMake exports are used by other packages that compile
and link against dcmtk. Because Debian moves some of
these executables and also dosn't install the test
executables, this import may fail leading to failure
to configure the according package.
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Gbp-Pq: Name 07_dont_export_all_executables.patch