libretro: enableParalellBuilding, except for older MAMEs

MAME since 0.225 have a fix for the build issues while building in
parallel. Since libretro.mame is on 0.227 right now, should be safe to
enable.

Since eventually enableParallelBuilding should be the default, enabling
it for all cores except the older MAMEs seems better than just enabling
for libretro.mame.

pkgs/misc/emulators/retroarch/cores.nix

···
             --add-flags "-L $COREDIR/${d2u core}_libretro${stdenv.hostPlatform.extensions.sharedLibrary} $@"
         '';
 
+        enableParallelBuilding = true;
+
         passthru = {
           inherit core;
           libretroCore = "/lib/retroarch/cores";
···
     core = "mame";
     description = "Port of MAME to libretro";
     license = with lib.licenses; [ bsd3 gpl2Plus ];
-
     extraBuildInputs = [ alsa-lib libGLU libGL portaudio python3 xorg.libX11 ];
     postPatch = ''
       # Prevent the failure during the parallel building of:
···
     license = "MAME";
     makefile = "Makefile";
     makeFlags = lib.optional (!stdenv.hostPlatform.isx86) "IS_X86=0";
+    enableParallelBuilding = false;
   };
 
   mame2003 = mkLibRetroCore {
···
     description = "Port of MAME ~2003 to libretro";
     license = "MAME";
     makefile = "Makefile";
+    enableParallelBuilding = false;
   };
 
   mame2003-plus = mkLibRetroCore {
···
     description = "Port of MAME ~2003+ to libretro";
     license = "MAME";
     makefile = "Makefile";
+    enableParallelBuilding = false;
   };
 
   mame2010 = mkLibRetroCore {
···
     license = "MAME";
     makefile = "Makefile";
     makeFlags = lib.optionals stdenv.hostPlatform.isAarch64 [ "PTR64=1" "ARM_ENABLED=1" "X86_SH2DRC=0" "FORCE_DRC_C_BACKEND=1" ];
+    enableParallelBuilding = false;
   };
 
   mame2015 = mkLibRetroCore {
···
     extraNativeBuildInputs = [ python27 ];
     extraBuildInputs = [ alsa-lib ];
     makefile = "Makefile";
+    enableParallelBuilding = false;
   };
 
   mame2016 = mkLibRetroCore {
···
       # make -C 3rdparty/genie/build/gmake.linux -f genie.make obj/Release/src/host/lua-5.3.0/src/lgc.o
       mkdir -p 3rdparty/genie/build/gmake.linux/obj/Release/src/host/lua-5.3.0/src
     '';
+    enableParallelBuilding = false;
   };
 
   mesen = mkLibRetroCore {
···
     src = getCoreSrc "mupen64plus";
     description = "Libretro port of Mupen64 Plus, GL only";
     license = lib.licenses.gpl3Only;
-
     extraBuildInputs = [ libGLU libGL libpng nasm xorg.libX11 ];
     makefile = "Makefile";
   };