cleanup: Remove NaCl support.

We now depend on libsodium unconditionally. Future work will require
functions from libsodium, and nobody we're aware of uses the nacl build
for anything other than making sure it still works on CI.

.github/scripts/autotools-linux

@@ -11,10 +11,7 @@ add_ld_flag -Wl,-z,defs
 # Make compilation error on a warning
 add_flag -Werror
 
-add_config_flag --with-nacl-libs="$CACHEDIR/lib/amd64"
-add_config_flag --with-nacl-headers="$CACHEDIR/include/amd64"
 add_config_flag --disable-ipv6
-add_config_flag --enable-nacl
 add_config_flag --enable-daemon
 add_config_flag --with-log-level=TRACE