security/distcache: fix strip-related comment and take maintainership

The comment said ``INSTALL_TARGET=install-strip isn't working'', that
is, does not strip shared libraries as expected, while actually this is
not a bug but intended behavior, per this quote from the INSTALL file:

[...] Fortunately, the GNU autotools have built-in support for this
functionality, all you need to do is to specify "make install-strip"
instead of "make install".  Note however that only executables are
stripped, libraries are not touched [...]