Remove the POD content and the overwriting makefile rule
'pveperf.1.pod' so that the rule from pve-doc-generator.mk matches
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
-w enabled warnings for all modules - even when these modules comes from the OS and are not compatible
with warnings. This is the reason to NOT use -w and instead use "use warnings".