Fix Linux debugging on NVIDIA + X11#770
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Hit several issues debugging on Arch + NVIDIA 595 + X11.
X11 window used CopyFromParent visual, mismatching EGL/GLX framebuffer config: GLX BadMatch crash, EGL silent black window. Renderer now publishes its chosen visual + colormap.
eglCreateContext got a null EGLConfig; NVIDIA lacks EGL_KHR_no_config_context, so the context silently no-op'd and all draws hit GL_INVALID_OPERATION. Pass the config; bind a pbuffer at init.
dmn_lnx_rdebug_vaddr_from_memory SIGILL'd on the GNU_HASH branch (NotImplemented). Modern toolchains link --hash-style=gnu only. Symbol count now derived from GNU_HASH.
Breakpoints didn't bind: rdi_from_dwarf built source paths from
dir_table[dir_idx]+ file->path without prependingdir_table[0], so build/main.c became /build/main.c. DWARFv5 6.2.4: relative dir entries append to entry 0.Memory view SIGILL'd on unimplemented eval ops at -Og/-O2. Implemented Swap; soft-fail BadOp for CallSiteValue (entry_value needs caller-frame regs, not plumbed); no-op for piece markers.
RDI cache redirected to ~/raddbg/rdi-cache when the binary lives under /usr, /lib, etc. - writes for libc.so/ld.so were failing.
Tested on ArchLinux + NVIDIA 595.58.03 + X11(dwm). Not tested on Mesa or Wayland.