Ok, I was reading the README in the new source code. I got to the line were it says: install dependencies:
$ sudo apt-get install cmake intltool libgtk-3-dev libssh-dev libavahi-ui-gtk3-dev libvte-2.90-dev libxkbfile-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
cmake is already the newest version.
autoconf2.13 autoconf-archive gnu-standards autoconf-doc libtool
The following NEW packages will be installed:
autoconf automake autotools-dev intltool libatk-bridge2.0-dev
libavahi-client-dev libavahi-common-dev libavahi-glib-dev libavahi-ui-gtk3-0
libavahi-ui-gtk3-dev libdbus-1-dev libgtk-3-dev libssh-dev libssl-dev
libssl-doc libvte-2.90-dev libvte-2.90-doc libwayland-dev libxkbcommon-dev
0 upgraded, 20 newly installed, 0 to remove and 0 not upgraded.
Need to get 4,839 kB of archives.
After this operation, 28.4 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Once I installed that, I tested the old version I am currently using, Remmina 0.9.99.1
runs, (as it did) but copy paste functionality has resumed.
The source for version 1 still failed to compile, that's a bummer, but as long as i can copy and paste in a relatively new version, I'm ok with this solution. Try it if you like.