Upstream appears to be disabling position independent code for some reason in the crispy-core library:
https://github.com/contour-terminal/contour/blob/master/src/crispy/CMakeLists.txt#L100 (although they are using no-pie, which is odd since it is a library and I would have expected no-pic instead, since pie is for executables not libraries...). Try removing those options from the build and running it again. CMake should automatically pick up the PIC/PIE options from the hardened build flags provided by the RPM build system.