src/c/<various>/Makefile: honor env var $PREFIX and prefer 'install -D' over cp        I left the defaults in the files as is.
src/c/<various>/Makefile: honor env var $PREFIX and prefer 'install -D' over cp
       I left the defaults in the files as is.


git-svn-id: 036a1c5f902f528d79fbac72fb947c91fe594755@187 9f305d85-0c50-0410-b3e0-65f4174694de

dbushong/crush-tools,dbushong/crush-tools,dbushong/crush-tools,dbushong/crush-tools