Because this 'feature' is broken (since 2013):
https://debbugs.gnu.org/cgi/bugreport.cgi?bug=13928
we have to replace all instances of $(top_srcdir) in *_SOURCES lines
with a relative path. According to what I read, this shouldn't break
split builds, but I didn't test it.
The only things automake moans about now are:
* Unescaped left brace in regex is deprecated, passed through in regex; marked by <-- HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at /usr/bin/automake line 3936.
- This is another bug in automake
* autoreconf: configure.ac: AM_GNU_GETTEXT is used, but not AM_GNU_GETTEXT_VERSION
- This is a feature, not a bug.
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