Replace symlinks with real files to fix pacman package build

[elrafoon]

When packaging paho.mqtt.c with MinGW for MSYS2, pacman unable is extract the symlinks from source archive - it uses bsdtar and it fails on symlinks when running under windows.

So patching sources in the package is not an option, because sources don't even get unpacked.

Only solution I found is to replace the symlinks with real files.

[elrafoon]

To be honest, I didn't know about c_rehash utility nor this project is using it. So I looked up the manpage.

In first sections it says:

c_rehash scans directories and calculates a hash value of each .pem, .crt, .cer, or .crl file in the specified directory list and creates symbolic links for each file, where the name of the link is the hash value. (If the platform does not support symbolic links, a copy is made.) This utility is useful as many programs that use OpenSSL require directories to be set up like this in order to find certificates.

I'm not too sure, but to me it seems like those symlinks shouldn't be in the repo anyway (because at least they are not portable). Instead, c_rehash should be executed during build and it would either create symlinks, or named copies, depending on host platform.

Am I right?