Updates mono to version 5.4.1.6

[tamizhvendan]

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[tamizhvendan]

@ademar After hours of trial and errors, I have fixed the signature mismatch error and I am able to build successfully. But while running the built buildpack, heroku reports the following error

remote: -----> Setting envvars
remote: -----> Importing trusted root certificates
remote: /app/tmp/buildpacks/92fea1525b84540a7fd606fa674cc2245e866bfe4761e80aa37bbbc6628cd5df9c0d29d3e533472e67ad3c88b66e521b467eae459bc01a5a4ad3ccf28171b4f3/bin/compile: line 61: cert-sync: command not found
remote:  !     Push rejected, failed to compile SuaveFramework app.
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !	Push rejected to fstweet.

When I tried manually copying it the tar to I am getting /usr/bin/mono command not found error.

When I checked the docker image those two files are there

$ site/ docker run -it -v ${PWD}/cache:/var/cache tamizhvendan/mono-builder /bin/bash
root@135ba8411eda:/# which cert-sync
/usr/bin/cert-sync
root@135ba8411eda:/# which mono
/usr/bin/mono

I am not sure how to fix it and So, I am just leaving it here to know what we can do to fix it?