If a `.la` file is empty, `lt_libdir` and/or `lt_dlname` won’t be set,
but will then still be used in `g_strconcat()`, leading to invalid
output.
Detect that and return an error.
Adds a unit test.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Coverity CID: #1474756
These have all been added manually, as I’ve finished all the files which
I can automatically detect.
All the license headers in this commit are for LGPL-2.1-or-later, and
all have been double-checked against the license paragraph in the file
header.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #1415
