apple-source-releases: Add some meta.platforms

Or Hydra tries to build them on Linux...

pkgs/os-specific/darwin/apple-source-releases/bootstrap_cmds/default.nix

@@ -41,4 +41,8 @@ appleDerivation {
       --replace '/bin/rmdir' "rmdir" \
       --replace 'C=''${MIGCC}' "C=cc"
   '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.darwin;
+  };
 }

pkgs/os-specific/darwin/apple-source-releases/bsdmake/default.nix

@@ -42,4 +42,8 @@ appleDerivation {
   preFixup = ''
     wrapProgram "$out/bin/bsdmake" --add-flags "-m $out/share/mk"
   '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.darwin;
+  };
 }

pkgs/os-specific/darwin/apple-source-releases/libauto/default.nix

@@ -77,4 +77,8 @@ appleDerivation {
     cp auto_zone.h auto_weak.h auto_tester/auto_tester.h auto_gdb_interface.h $out/include
     cp libauto.dylib $out/lib
   '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.darwin;
+  };
 }

pkgs/os-specific/darwin/apple-source-releases/libiconv/default.nix

@@ -13,4 +13,8 @@ appleDerivation {
       -Wl,-reexport_library -Wl,$out/lib/libiconv-nocharset.dylib \
       -Wl,-reexport_library -Wl,$out/lib/libcharset.dylib
   '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.darwin;
+  };
 }

pkgs/os-specific/darwin/apple-source-releases/libpthread/default.nix

@@ -16,4 +16,8 @@ appleDerivation {
     cp -r sys $out/include
     cp -r sys/_pthread/*.h $out/include/sys/_types/
   '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.darwin;
+  };
 }

pkgs/os-specific/darwin/apple-source-releases/xnu/default.nix

@@ -127,4 +127,8 @@ appleDerivation {
     mkdir $out/Library/PrivateFrameworks
     mv $out/Library/Frameworks/IOKit.framework $out/Library/PrivateFrameworks
   '';
+
+  meta = {
+    platforms = stdenv.lib.platforms.darwin;
+  };
 }