portmidi: create links for porttime

At least mixxx tries to find porttime libs. Help them by creating symlinks

Signed-off-by: Andreas Müller <schnitzeltony@googlemail.com>

recipes-misc/recipes-multimedia/portmidi/portmidi_217.bb

@@ -27,3 +27,9 @@ EXTRA_OECMAKE += " \
     -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=Release \
     -DCMAKE_RUNTIME_OUTPUT_DIRECTORY=Release \
 "
+
+do_install_append() {
+    ln -s libportmidi.so.0. "${D}/${libdir}/libporttime.so"
+    ln -s libportmidi.so.0. "${D}/${libdir}/libporttime.so.0"
+    ln -s libportmidi.so.0. "${D}/${libdir}/libporttime.so.0."
+}