Fixed checks for lzf when headers are inside include/liblzf (ubuntu 20.04)

[iliaal]

Fixed checks for lzf when headers are inside include/liblzf (ubuntu 20.04)

In some distributions lzf.h is not inside include/ but instead in include/libzlf this tweak adds extra checks for that allowing lzf support to be enabled.

Updated PR to be based on develop branch

[remicollet]

IMHO, should be better to rely on pkg-config output, especially as this is now the default way for lot of libraries (7.4+)

[remicollet]

@iliaal can you check if PR #1779 works for you ?

[iliaal]

IMHO, should be better to rely on pkg-config output, especially as this is now the default way for lot of libraries (7.4+)

The issue is that pkg-config may not be installed. For example ubuntu 20.04 or 18.04 by default doesn't seem to include it, even with dev tools installed

[remicollet]

pkg-config is a must have now, since 7.4, heavily used but lot of extensions.

BTW, I didn't mean that this change is bad, both PR can be merged, only that pkg-config is the cleanest way to find build options, rather than having distro specific checks.

[iliaal]

pkg-config is a must have now, since 7.4, heavily used but lot of extensions.

BTW, I didn't mean that this change is bad, both PR can be merged, only that pkg-config is the cleanest way to find build options, rather than having distro specific checks.

That makes sense, if pkg-config available it clearly is a cleaner approach, if it doesn't then the older approach with patch I think is a valid solution

[iliaal]

@michael-grunder What do you think?