Update Makefile.example to make more like winners #1009
Merged
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To help the judges in integrating winning entries to the winner repo, the Makefile.example file now shows how to include alt code.
It also points out that for variables one should put a space after the '=' unless it is empty.
Disable -g3. I have a lot of experience with -g and it never works well if optimisation is enabled (and it's -O3). Also, in macOS it makes the annoying .dSYM directory.
It points out that for the try rule if the program does not need any arg you do not have to specify any.
Updated .gitignore to have '.*.sw[a-zA-Z0-9]', which was discovered as missing when I had Makefile.example open when committing.