ARROW-1308: [C++] Link utility executables to Arrow shared library if ARROW_BUILD_STATIC=off
ARROW-1308: [C++] Link utility executables to Arrow shared library if ARROW_BUILD_STATIC=off

Author: Wes McKinney <wes.mckinney@twosigma.com>

Closes #931 from wesm/ARROW-1308 and squashes the following commits:

88391fe0 [Wes McKinney] Link utility executables to Arrow shared library if ARROW_BUILD_STATIC=off

siddharthteotia/arrow,pcmoritz/arrow,icexelloss/arrow,pcmoritz/arrow,pcmoritz/arrow,NonVolatileComputing/arrow,wesm/arrow,kou/arrow,NonVolatileComputing/arrow,kou/arrow,jeffknupp/arrow,majetideepak/arrow,renesugar/arrow,dremio/arrow,siddharthteotia/arrow,majetideepak/arrow,icexelloss/arrow,kou/arrow,laurentgo/arrow,dremio/arrow,xhochy/arrow,apache/arrow,yufeldman/arrow,wesm/arrow,apache/arrow,icexelloss/arrow,apache/arrow,cpcloud/arrow,xhochy/arrow,majetideepak/arrow,kou/arrow,laurentgo/arrow,apache/arrow,siddharthteotia/arrow,itaiin/arrow,renesugar/arrow,wesm/arrow,wesm/arrow,jeffknupp/arrow,kou/arrow,siddharthteotia/arrow,NonVolatileComputing/arrow,itaiin/arrow,apache/arrow,itaiin/arrow,pcmoritz/arrow,dremio/arrow,dremio/arrow,wesm/arrow,cpcloud/arrow,itaiin/arrow,renesugar/arrow,NonVolatileComputing/arrow,kou/arrow,dremio/arrow,wagavulin/arrow,wagavulin/arrow,itaiin/arrow,wesm/arrow,dremio/arrow,pcmoritz/arrow,kou/arrow,icexelloss/arrow,tebeka/arrow,tebeka/arrow,cpcloud/arrow,renesugar/arrow,wesm/arrow,apache/arrow,NonVolatileComputing/arrow,wagavulin/arrow,NonVolatileComputing/arrow,itaiin/arrow,tebeka/arrow,cpcloud/arrow,renesugar/arrow,kou/arrow,renesugar/arrow,siddharthteotia/arrow,yufeldman/arrow,jeffknupp/arrow,cpcloud/arrow,siddharthteotia/arrow,apache/arrow,laurentgo/arrow,jeffknupp/arrow,cpcloud/arrow,renesugar/arrow,jeffknupp/arrow,laurentgo/arrow,yufeldman/arrow,NonVolatileComputing/arrow,itaiin/arrow,tebeka/arrow,siddharthteotia/arrow,yufeldman/arrow,apache/arrow,pcmoritz/arrow,cpcloud/arrow,itaiin/arrow,icexelloss/arrow,wagavulin/arrow,laurentgo/arrow,renesugar/arrow,icexelloss/arrow,pcmoritz/arrow,kou/arrow,icexelloss/arrow,xhochy/arrow,icexelloss/arrow,laurentgo/arrow,xhochy/arrow,wesm/arrow,icexelloss/arrow,wagavulin/arrow,dremio/arrow,yufeldman/arrow,laurentgo/arrow,itaiin/arrow,siddharthteotia/arrow,laurentgo/arrow,majetideepak/arrow,wagavulin/arrow,pcmoritz/arrow,cpcloud/arrow,wagavulin/arrow,xhochy/arrow,laurentgo/arrow,dremio/arrow,tebeka/arrow,icexelloss/arrow,apache/arrow,majetideepak/arrow,jeffknupp/arrow,itaiin/arrow,tebeka/arrow,wesm/arrow,siddharthteotia/arrow,pcmoritz/arrow,tebeka/arrow,itaiin/arrow,tebeka/arrow,laurentgo/arrow,majetideepak/arrow,pcmoritz/arrow,wesm/arrow,dremio/arrow,yufeldman/arrow,yufeldman/arrow,majetideepak/arrow,majetideepak/arrow,pcmoritz/arrow,NonVolatileComputing/arrow,apache/arrow,apache/arrow,jeffknupp/arrow,icexelloss/arrow,majetideepak/arrow,wesm/arrow,icexelloss/arrow,cpcloud/arrow,NonVolatileComputing/arrow,wagavulin/arrow,apache/arrow,laurentgo/arrow,renesugar/arrow,xhochy/arrow,pcmoritz/arrow,laurentgo/arrow,xhochy/arrow,majetideepak/arrow,wagavulin/arrow,renesugar/arrow,renesugar/arrow,renesugar/arrow,kou/arrow,dremio/arrow,xhochy/arrow,yufeldman/arrow,tebeka/arrow,icexelloss/arrow,itaiin/arrow,icexelloss/arrow,apache/arrow,kou/arrow,majetideepak/arrow,yufeldman/arrow,cpcloud/arrow,siddharthteotia/arrow,jeffknupp/arrow,majetideepak/arrow,xhochy/arrow,itaiin/arrow,NonVolatileComputing/arrow,kou/arrow,pcmoritz/arrow,renesugar/arrow,renesugar/arrow,jeffknupp/arrow,wagavulin/arrow,xhochy/arrow,wagavulin/arrow,kou/arrow,xhochy/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,jeffknupp/arrow,itaiin/arrow,apache/arrow,xhochy/arrow,wesm/arrow,wesm/arrow,cpcloud/arrow,yufeldman/arrow,majetideepak/arrow,jeffknupp/arrow,xhochy/arrow,cpcloud/arrow,majetideepak/arrow,siddharthteotia/arrow,cpcloud/arrow,cpcloud/arrow,renesugar/arrow,xhochy/arrow,laurentgo/arrow,majetideepak/arrow,laurentgo/arrow,laurentgo/arrow,dremio/arrow,xhochy/arrow,wagavulin/arrow,tebeka/arrow,pcmoritz/arrow,yufeldman/arrow,wesm/arrow,itaiin/arrow,kou/arrow