devel/glib2: Add the patch deleted in the recent update

The patch sets LD_LIBRARY_PATH so that uninstalled
glib-compile-resources can find libraries. This fixes the following
error during build on Darwin:

[651/1015] Generating plugin-resources.c with a custom command.
FAILED: gio/tests/plugin-resources.c
/Users/pbulk/pkgsrc/work/devel/glib2/work/glib-2.62.4/output/gio/glib-compile-resources --target=gio/tests/plugin-resources.c --sourcedir=/Users/pbulk/pkgsrc/work/devel/glib2/work/glib-2.62.4/gio/tests --generate-source --c-name _g_plugin ../gio/tests/test4.gresource.xml
    dyld: Library not loaded: @rpath/libgio-2.0.0.dylib
      Referenced from: /Users/pbulk/pkgsrc/work/devel/glib2/work/glib-2.62.4/output/gio/glib-compile-resources
      Reason: image not found

(minskim)