ARROW-5446: [C++][CMake] Install arrow/util/config.h into CMAKE_INSTALL_INCLUDEDIR
ARROW-5446: [C++][CMake] Install arrow/util/config.h into CMAKE_INSTALL_INCLUDEDIR

Author: Nuno Sucena Almeida <288957+slug@users.noreply.github.com>

Closes #4387 from slug/config-install-fix and squashes the following commits:

bacfdaf27 <Nuno Sucena Almeida> config install dir

wesm/arrow,xhochy/arrow,laurentgo/arrow,icexelloss/arrow,wesm/arrow,majetideepak/arrow,apache/arrow,kou/arrow,apache/arrow,xhochy/arrow,majetideepak/arrow,cpcloud/arrow,apache/arrow,kou/arrow,kou/arrow,apache/arrow,renesugar/arrow,cpcloud/arrow,kou/arrow,renesugar/arrow,majetideepak/arrow,cpcloud/arrow,icexelloss/arrow,icexelloss/arrow,xhochy/arrow,cpcloud/arrow,apache/arrow,renesugar/arrow,icexelloss/arrow,wesm/arrow,laurentgo/arrow,renesugar/arrow,apache/arrow,icexelloss/arrow,wesm/arrow,cpcloud/arrow,renesugar/arrow,xhochy/arrow,kou/arrow,renesugar/arrow,xhochy/arrow,cpcloud/arrow,laurentgo/arrow,laurentgo/arrow,renesugar/arrow,laurentgo/arrow,apache/arrow,majetideepak/arrow,icexelloss/arrow,renesugar/arrow,laurentgo/arrow,icexelloss/arrow,laurentgo/arrow,xhochy/arrow,majetideepak/arrow,apache/arrow,laurentgo/arrow,wesm/arrow,wesm/arrow,apache/arrow,xhochy/arrow,cpcloud/arrow,majetideepak/arrow,wesm/arrow,renesugar/arrow,icexelloss/arrow,majetideepak/arrow,renesugar/arrow,kou/arrow,laurentgo/arrow,apache/arrow,wesm/arrow,kou/arrow,kou/arrow,xhochy/arrow,wesm/arrow,majetideepak/arrow,kou/arrow,laurentgo/arrow,cpcloud/arrow,majetideepak/arrow,renesugar/arrow,cpcloud/arrow,icexelloss/arrow,majetideepak/arrow,kou/arrow,kou/arrow,icexelloss/arrow,laurentgo/arrow,renesugar/arrow,apache/arrow,xhochy/arrow,apache/arrow,laurentgo/arrow,kou/arrow,renesugar/arrow,majetideepak/arrow,xhochy/arrow,apache/arrow,icexelloss/arrow,icexelloss/arrow,wesm/arrow,wesm/arrow,majetideepak/arrow,kou/arrow,icexelloss/arrow,xhochy/arrow,laurentgo/arrow,wesm/arrow,wesm/arrow,majetideepak/arrow,cpcloud/arrow,laurentgo/arrow,xhochy/arrow,xhochy/arrow,cpcloud/arrow,apache/arrow,icexelloss/arrow,cpcloud/arrow,renesugar/arrow,cpcloud/arrow,kou/arrow,majetideepak/arrow,wesm/arrow,xhochy/arrow,majetideepak/arrow,renesugar/arrow,xhochy/arrow,laurentgo/arrow,cpcloud/arrow