* Debian like distros use multiarch implementation spec
https://wiki.ubuntu.com/MultiarchSpec
Instead of being limited to /usr/lib64, architecture based
lib directories are used. For instance, under ubuntu a library package
on x86_64 installs binaries under /usr/lib/x86_64-linux-gnu.
Building pmix with external dependencies like hwloc or libevent
fail as with prefix set to /usr, that prefix works for
headers and binaries but does not work for libraries. The default
location for library /usr/lib64 does not hold installed binaries.
Pmix build options --with-libevent and --with-libhwloc allow us to
specify dependent library locations. This commit is an effort to
highlight and resolve such an issue when a users want to use Debian like
distro library packages and use spack to build pmix.
There maybe other packages that might be impacted in a similar way.
* Adding libs property to hwloc and libevent and some cleanups to pmix patch
* Fixing style and adding comment on Pmix' 32-bit hwloc version detection issue
f9d9d43b63