CMP0026
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Disallow use of the LOCATION target property.

CMake 2.8.12 and lower allowed reading the LOCATION target property to
determine the eventual location of build targets.  This relies on the
assumption that all necessary information is available at
configure-time to determine the final location and filename of the
target.  However, this property is not fully determined until later at
generate-time.  At generate time, the $<TARGET_FILE> generator
expression can be used to determine the eventual LOCATION of a target
output.

Code which reads the LOCATION target property can be ported to use the
$<TARGET_FILE> generator expression together with the file(GENERATE)
subcommand to generate a file containing the target location.

The OLD behavior for this policy is to allow reading the LOCATION
property from build-targets.  The NEW behavior for this policy is to
not to allow reading the LOCATION property from build-targets.

This policy was introduced in CMake version 2.8.13.  CMake version
|release| warns when the policy is not set and uses OLD behavior.  Use
the cmake_policy command to set it to OLD or NEW explicitly.
