simplify and cleanup cuda feature checks

packaging/rpm/xpra.spec

@@ -14,31 +14,37 @@
 %{!?update_firewall: %define update_firewall 1}
 %{!?run_tests: %define run_tests 0}
 %{!?with_selinux: %define with_selinux 1}
-#we only enable CUDA / NVENC with 64-bit builds:
+
+%ifarch aarch64 riscv5
+%{!?nthreads: %global nthreads 1}
+%endif
+%ifarch riscv5
+%define nvidia_codecs 0
+%endif
+
 %if 0%{?with_cuda}%{?nvidia_codecs}
 %define nvidia_codecs 1
 %else
-#detect:
-%if 0%{?fedora}>=38
-%define nvidia_codecs 0
-%else
 %{!?nvidia_codecs: %define nvidia_codecs %(pkg-config --exists cuda && echo 1)}
 %endif
+
+%if 0%{?fedora}%{?el10}
+%global debug_package %{nil}
+%endif
+%if 0%{?el10}
+%define DEFAULT_BUILD_ARGS --with-Xdummy --without-Xdummy_wrapper --without-csc_cython --without-evdi --without-cuda_rebuild --without-docs
 %endif
+
+
 %if 0%{?nvidia_codecs}
 %define build_args %{DEFAULT_BUILD_ARGS}
 %else
 %define build_args %{DEFAULT_BUILD_ARGS} --without-nvidia
-%if 0%{?fedora}>=39
-%global debug_package %{nil}
-%endif
 %endif
+
 %global selinux_variants mls targeted
 %define selinux_modules cups_xpra xpra_socketactivation
 
-%ifarch aarch64 riscv5
-%{!?nthreads: %global nthreads 1}
-%endif
 
 %if 0%{?el7}
 echo CentOS / RHEL 7.x is no longer supported