[C++] CMake functions to simplify shared / static library configuration

[asfimport]

We're accumulating a lot of boilerplate for setting various properties (like RPATH on OS X) to make shared libraries work well. We also are not consistently building static libraries (see ARROW-303). We would benefit from a helper macro function to rearrange this cmake code in a more reusable form

Reporter: Wes McKinney / @wesm
Assignee: Uwe Korn / @xhochy

_{Note: This issue was originally created as ARROW-330. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
PR: #255

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 255
#255