arangodb: remove unused cmake flags

USE_OPTIMIZE_FOR_ARCHITECTURE was removed without commit in a prior
commit. This is because it was removed upstream:

https://github.com/arangodb/arangodb/commit/cc860c333c7f0c1aed9a2179e3e8b926d92b6df4

This is unfortunate - now /proc/cpuinfo is read unconditionally for
feature detection.

Some other means of feature detection will have to be found.

pkgs/servers/nosql/arangodb/default.nix

@@ -41,14 +41,7 @@ stdenv.mkDerivation rec {
     substituteInPlace js/server/server.js --replace "require('@arangodb').checkAvailableVersions();" ""
   '';
 
-  cmakeFlags = [
-    # disable "maintainer mode"
-    "-DUSE_MAINTAINER_MODE=OFF"
-
-    # avoid using builder's /proc/cpuinfo
-    "-DHAVE_SSE42=${if stdenv.hostPlatform.sse4_2Support then "ON" else "OFF"}"
-    "-DASM_OPTIMIZATIONS=${if stdenv.hostPlatform.sse4_2Support then "ON" else "OFF"}"
-  ];
+  cmakeFlags = [ "-DUSE_MAINTAINER_MODE=OFF" ];
 
   meta = with lib; {
     homepage = "https://www.arangodb.com";