Remove unused SHARED_* build variables.
Remove unused SHARED_* build variables.

Remove the SHARED_* build variables from configure, since they
are not used.

bryancall/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,davidbz/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,dyrock/trafficserver,dyrock/trafficserver,dyrock/trafficserver,pbchou/trafficserver,bryancall/trafficserver,pbchou/trafficserver,bryancall/trafficserver,davidbz/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,persiaAziz/trafficserver,dyrock/trafficserver,duke8253/trafficserver,duke8253/trafficserver,duke8253/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,dyrock/trafficserver,duke8253/trafficserver,davidbz/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,dyrock/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,persiaAziz/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,davidbz/trafficserver,persiaAziz/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,persiaAziz/trafficserver,vmamidi/trafficserver,chitianhao/trafficserver,persiaAziz/trafficserver,persiaAziz/trafficserver,vmamidi/trafficserver,davidbz/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver