It is built successfully and installed correctly in /usr/lib/apache2/modules directroy.
and
Cannot load /etc/apache2/modules/mod_mapcache.so into server: /etc/apache2/modules/mod_mapcache.so: cannot open shared object file: No such file or directory
The module isn't installed where the Apache expects it as per configuration.
So you might like to change the module's configuration to be:
LoadModule mapcache_module /usr/lib/apache2/modules/mod_mapcache.so