cmake: Control manpages generation
cmake: Control manpages generation

Introduce ENABLE_MAN cmake option to control manpages generation. It is enabled
by default.

Signed-off-by: Ovidiu Panait <525ccf55724fd4a885e89a7dd58ce23c85b43478@gmail.com>

iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace,iovisor/bpftrace