Merge pull request #129944 from NixOS/backport-129223-to-release-21.05

[Backport release-21.05] ccls: set resource directory

pkgs/development/tools/misc/ccls/wrapper

@@ -4,6 +4,6 @@ printf -v extraArgs ',\"%s\"' \
   $(cat @clang@/nix-support/libc-cflags \
         @clang@/nix-support/libcxx-cxxflags) \
   ${NIX_CFLAGS_COMPILE}
-initString="--init={\"clang\":{\"extraArgs\":[${extraArgs:1}]}}"
+initString="--init={\"clang\":{\"extraArgs\":[${extraArgs:1}],\"resourceDir\":\"@clang@/resource-root\"}}"
 
 exec -a "$0" "@out@/bin/@wrapped@" "${initString}" "$@"