Files etc/libpthread.so-types.conf and etc/libc.so-types.conf was introduced in
commit 5ba9e10 ("Split type definitions from the bundled configs into their own
files"). However, they was not installed.

So latrce failed with messages like :
/usr/share/ltrace/libm.so.conf:333: error: unknown type around 'ldouble erfl(ldouble);

This patch declare these configuration files.

Signed-off-by: Jérôme Pouiller <jezz@sysmic.org>