emacs-module.h: Create emacs_env_26
This was part of the original design of the module API (https://lists.gnu.org/archive/html/emacs-devel/2015-02/msg00960.html), but I didn't take it into account when adding the should_quit function. Instead of duplicating the environment fields or using the C preprocessor, use configure to build emacs-module.h. * configure.ac: Expand emacs-module.h template.
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