n6.1.4
avfilter: compress CUDA PTX code if possible
riscv: test for assembler support
ffbuild/common: Fix CPPFLAGS applied for compiling C++ files
Fix libversion.sh for split version headers, to unbreak shared library builds
Merge commit '92db5083077a8b0f8e1050507671b456fd155125'
Merge commit '11a9320de54759340531177c9f2b1e31e6112cc2'