debian: improve package dep list

This is based on the Build-Depends in debian/control.

Signed-off-by: Sage Weil <sage@inktank.com>
Makefile: make install-deps rule

This only works if autoconf is happy, but it's better than nothing.

Fixes: #8259
Signed-off-by: Sage Weil <sage@inktank.com>