Unify test and mkdir target

[arkamar]

This change prefers TARGET variable over the hardcoded name.

However, I am not sure why we need to create empty /usr/local/sslsplit directory in the filesystem. I believe that we should remove lines

    test -d $(DESTDIR)$(PREFIX)/$(TARGET) || \
            $(MKDIR) -p $(DESTDIR)$(PREFIX)/sslsplit

with similar reason like in #251, distributions should create it in theirs preferred location.

[droe]

Your fix is certainly correct and will be applied. I'll look into the suggestion for removing it entirely later today, at first thought the suggestion seems sound.

[arkamar]

I just realized that we install sslsplit.conf.sample there. Anyway, it violates FHS/Gentoo policy and I have to change the location to something else. I use /usr/share/doc/sslsplit-${VERSION} currently, but $(DESTDIR)etc sounds also reasonable to me.

[droe]

After looking into this, I think the default should be creating a directory $(DESTDIR)$(PREFIX)/etc/sslsplit and putting the sample config there, matching the paths contained in the sample config. I'd further suggest to introduce a variable allowing you to override the default config directory for easy overriding.

[arkamar]

Thanks.