gtk3 include handling - Improving IDE support

[Michael Weghorn]

On 17/12/2018 09.14, Stephan Bergmann wrote:

> Indeed, for better or worse, e.g. all the *_CFLAGS in
> RepositoryExternal.mk are passed into gb_LinkTarget_set_include, not
> gb_LinkTarget_set_cxxflags.  Feel free to go with this approach, I'd say
> in vcl/Library_vclplug_gtk3.mk, I'd say.

Thanks for the quick reply! I'll go with the updated
https://gerrit.libreoffice.org/#/c/65207 then.