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BUG: Don't set empty osx version for exteranl non-cmake projects

Sam Horvath requested to merge github/fork/blowekamp/FixExternalOSXEnvironment into master

Created by: blowekamp

Building PCRE on OSX with the default configuration was failing during configuration:

checking whether the C compiler works... no

configure: error: in /scratch/blowekamp/build/Slicer/PCRE-prefix/src/PCRE-build': configure: error: C compiler cannot create executables Seeconfig.log' for more details.

This was due to the following flag being passed: "-mmacosx-version-min=".

Now this flag is not set if CMAKE_OSX_DEPLOYMENT_TARGET does not have a value.

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