All the tested cross builds don't build galleries, so the
cross-toolset won't contain gengal and no vcl is build.
To fix the full static build, add LIBWEBP to the list of
PERMITTED_BUILD_TARGETS and use gb_CONFIGURE_PLATFORMS to
provide the --host and --build flags.
Regression from commit 60eaa424c5
("support for the WebP image format (tdf#114532)").
Change-Id: I017c4fc72456859616d535ddfb2d568442ffa446
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/129790
Tested-by: Jenkins
Reviewed-by: Jan-Marek Glogowski <glogow@fbihome.de>
libwebp is a library to encode and decode images in WebP format, from [https://developers.google.com/speed/webp/]