Support older VIM without syn iskeyword

[vcargats]

syn iskeyword was added in 7.4.1142. This adds a fallback to 'setlocal iskeyword'.

[sheerun]

I'd suggest changing build script so syn is replaced by setlocal iskeyword in all files automatically during build

[vcargats]

hm... I have checked other syntax files. It turns out that a half of those which use 'syn iskeyword' already have a fallback.

So these are that have the fallback:
blade.vim
mapple.vim
pgsql.vim
bicep.vim
hcl.vim
lisp.vim

And these are that don't have:
pf.vim
crystal.vim
html.vim
awk.vim
dune.vim
svelte.vim
mf.vim
debcontrol.vim
kabal.vim
tydy.vim

Now I can modify the build script and replace just the files that do not yet have the fallback.

Or I may create corresponding PRs for the original syntax files if their repos still exist/supported, so that new versions will be eventually pulled into this repo. css.vim for example is deprecated, so I think I need to change that here.

What do you think?

[sheerun]

Build script is the easiest way, but you can send PRs to other repos if you want it. I've just pushed updated build

[vcargats]

Your latest commit does not have build script.
So you were going to replace that by yourself? I just didn't understand.

[sheerun]

No, go ahead. I meant it just as in "For your information"