[autotools] gtk-doc.m4 - cross compile support


gtk-doc.m4[1] is using pkg-config to locate the gtk-doc tool. This is
working for native build, however, when cross compiling the gtk-doc
tool should be installed on the build and not host, hence it is not
available at pkg-config.

It seems like pkg-config is just used for testing version
compatibility, this can be replaced by executing a tool with version
argument or when cross compiling require an environment variable with
version of the tool to bypass.

What do you think the best way to support cross compile?


[1] https://github.com/GNOME/gtk-doc/blob/master/buildsystems/autotools/gtk-doc.m4

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