[Mingw-cross-env-list] Add CLN library

[Richard Crozier]

I would like to add the CLN library to MXE

https://www.ginac.de/CLN/

The intention is ultimately to add the Ginac library which depends on it.

https://www.ginac.de/

The CLN library is mirrored in a github repo with patched for a win64 
build here:

https://github.com/jrheinlaender/cln/tree/w64

specifically I want the "w84" branch. My first attempt at a libcln.mk 
file is attached. I don't have a checksum for this, so I put libcln.mk 
in the mxe/src directory and tried to make one using:

make update-checksum-libcln

but this gives the error:

$ make update-checksum-libcln
mkdir -p '/opt/mxe/pkg' && ( (wget --user-agent='Wget/1.19.4' -t 2 
--timeout=6 -T 30 -t 3 -O '/opt/mxe/pkg/.tmp-' '' && true)   ) && cat 
'/opt/mxe/pkg/.tmp-'   > '/opt/mxe/pkg/' &&  rm '/opt/mxe/pkg/.tmp-' || 
( echo; echo 'Download failed!'; echo; rm -f '/opt/mxe/pkg/' 
'/opt/mxe/pkg/.tmp-'; )  && sed -i 's/^\([^ ]*_CHECKSUM *:=\).*/\1 
'"`openssl dgst -sha256 '/opt/mxe/pkg/' 2>/dev/null | sed -n 
's,^.*\([0-9a-f]\{64\}\)$,\1,p'`"'/' '/opt/mxe/src/libcln.mk'
http://: Invalid host name.

Download failed!

rm: cannot remove '/opt/mxe/pkg/': Is a directory
mxe.updates.mk:76: recipe for target 'update-checksum-libcln' failed
make: *** [update-checksum-libcln] Error 1


I then tried  make libcln to see what would happen but I get

$ make libcln
[disabled]    libcln                 x86_64-w64-mingw32.static
[disabled]    libcln                 x86_64-w64-mingw32.shared


Could I get some tips on creating the package please?

I have tested that the cln library can be build manually using mxe with 
./configure --host=x86_64-w64-mingw32.static.

Regards,

Richard

libcln.mk
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