cmake: Rename HAVE_* variables to LIZARDFS_HAVE_*

This is to avoid conflicts with other libraries (eg. Thrift) which
define symbols with the same names in their config.h files. The commit
was generated automatically using:

  git ls-tree -r --name-only HEAD \
    | grep -v external \
    | xargs grep -l HAVE_ \
    | xargs -n1 sed -i -e 's/HAVE_/LIZARDFS_HAVE_/g'

Change-Id: Iaffe6f1c097fb1893ac8e28f7175200b343f1a62