saugns v0.5.0c. Fix for builds with the clang 19 compiler. This is for an issue known to have affected x86-64. No difference for gcc nor for clang 18 and older. With clang 19, to keep -ffast-math builds from having broken FM and PM, never use lrint()/lrintf(), always use llrint()/llrintf() even when C type `long` is 64-bit. (Otherwise the former turn into 32-bit result instructions that clip values in some places.)