Fix build for memset error

Patch from Fedora.
Suppress CMake warnings

Patch from Fedora.
Make libparanoia build

Fails with this error:

[   31s] /home/abuild/rpmbuild/BUILD/cdrkit-1.1.11/libparanoia/paranoia.c: In function 'i_silence_match':
[   31s] /home/abuild/rpmbuild/BUILD/cdrkit-1.1.11/libparanoia/paranoia.c:666:26: error: argument to 'sizeof' in 'memset' call is the same expression as the destination; did you mean to dereference it? [-Werror=sizeof-pointer-memaccess]
[   31s]    memset(avec, 0, sizeof (avec));
[   31s]                           ^
[   31s] cc1: all warnings being treated as errors