mesa, libglvnd, xorg: disable tls w/musl

pkgs/development/libraries/libglvnd/default.nix

@@ -22,6 +22,9 @@ in stdenv.mkDerivation rec {
     "-DDEFAULT_EGL_VENDOR_CONFIG_DIRS=\"${driverLink}/share/glvnd/egl_vendor.d:/etc/glvnd/egl_vendor.d:/usr/share/glvnd/egl_vendor.d\""
   ];
 
+  # Indirectly: https://bugs.freedesktop.org/show_bug.cgi?id=35268
+  configureFlags  = stdenv.lib.optional stdenv.hostPlatform.isMusl "--disable-tls";
+
   # Upstream patch fixing use of libdl, should be in next release.
   patches = [
     (fetchpatch {

pkgs/development/libraries/mesa/default.nix

@@ -125,7 +125,8 @@ let self = stdenv.mkDerivation {
     "--enable-gles1"
     "--enable-gles2"
     "--enable-glx"
-    "--enable-glx-tls"
+    # https://bugs.freedesktop.org/show_bug.cgi?id=35268
+    (enableFeature (!stdenv.hostPlatform.isMusl) "glx-tls")
     "--enable-gallium-osmesa" # used by wine
     "--enable-llvm"
     "--enable-egl"

pkgs/servers/x11/xorg/overrides.nix

@@ -512,6 +512,8 @@ in
           "--with-xkb-path=${xorg.xkeyboardconfig}/share/X11/xkb"
           "--with-xkb-output=$out/share/X11/xkb/compiled"
           "--enable-glamor"
+        ] ++ lib.optionals stdenv.hostPlatform.isMusl [
+          "--disable-tls"
         ];
         postInstall = ''
           rm -fr $out/share/X11/xkb/compiled # otherwise X will try to write in it