No need to mention "/solver", I think

We already mention /*/unxlng???, /*/unxlng???.pro etc which should
cover the normal $OUTDIR. We do now have one git-managed file in
solver, README. Not mentioning /solver means git status will notice
other files or subdirectories accidentally or misguidedly added in
solver.

Change-Id: Ie70b9ff32ac9c7282cef8d28ff04f3a22e4a78f6

.gitignore

@@ -40,7 +40,6 @@
 /*/wnt*.obsolete
 /*/callcatcher
 /workdir
-/solver
 /instsetoo_native/util/LibreOffice
 /instsetoo_native/util/LibreOffice_SDK