Makefile: remove ISSUE_TEMPLATE.md from the 'all' target (fixes #9088)

It isn't included in the tar file, causing build failures.
Since it's only used for GitHub, I think we don't need to store it in the tar file.

Makefile

@@ -1,4 +1,4 @@
-all: youtube-dl README.md CONTRIBUTING.md .github/ISSUE_TEMPLATE.md README.txt youtube-dl.1 youtube-dl.bash-completion youtube-dl.zsh youtube-dl.fish supportedsites
+all: youtube-dl README.md CONTRIBUTING.md README.txt youtube-dl.1 youtube-dl.bash-completion youtube-dl.zsh youtube-dl.fish supportedsites
 
 clean:
 	rm -rf youtube-dl.1.temp.md youtube-dl.1 youtube-dl.bash-completion README.txt MANIFEST build/ dist/ .coverage cover/ youtube-dl.tar.gz youtube-dl.zsh youtube-dl.fish *.dump *.part *.info.json *.mp4 *.flv *.mp3 *.avi CONTRIBUTING.md.tmp ISSUE_TEMPLATE.md.tmp youtube-dl youtube-dl.exe