treewide: remove redundant quotes

pkgs/development/libraries/v8/5_x.nix

@@ -17,7 +17,7 @@ let
   sharedFlag = if static then "static_library" else "shared_library";
 
   deps = {
-    "build" = fetchgit {
+    build = fetchgit {
       url = "${git_url}/chromium/src/build.git";
       rev = "2c67d4d74b6b3673228fab191918500a582ef3b0";
       sha256 = "0jc7hci5yh792pw0ahjfxrk5xzllnlrv9llmwlgcgn2x8x6bn34q";
@@ -32,7 +32,7 @@ let
       rev = "b5ecbb29a26532f72ef482569b223d5a51fd50bf";
       sha256 = "0ld47wdnk8grcba221z67l3pnphv9zwifk4y44f5b946w3iwmpns";
     };
-    "buildtools" = fetchgit {
+    buildtools = fetchgit {
       url = "${git_url}/chromium/buildtools.git";
       rev = "60f7f9a8b421ebf9a46041dfa2ff11c0fe59c582";
       sha256 = "0i10bw7yhslklqwcx5krs3k05sicb73cpwd0mkaz96yxsvmkvjq0";

pkgs/development/libraries/v8/default.nix

@@ -14,7 +14,7 @@ let
       rev    = "936ba8a963284a6b3737cf2f0474a7131073abee";
       sha256 = "14nr22fqdpxma1kzjflj6a865vr3hfnnm2gs4vcixyq4kmfzfcy2";
     };
-    "build" = fetchgit {
+    build = fetchgit {
       url    = "${git_url}/chromium/src/build.git";
       rev    = "325e95d6dae64f35b160b3dc7d73218cee5ec079";
       sha256 = "0dddyxa76p2xpjhmxif05v63i5ar6h5v684fdl667sg84f5bhhxf";

pkgs/development/libraries/v8/plv8_6_x.nix

@@ -24,12 +24,12 @@ let
       rev    = "0e9a47d74970bee1bbfc063c47215406f8918699";
       sha256 = "07rbzrlscp8adh4z86yl5jxdnvgkc3xs950xldpk318wf9i3bh6c";
     };
-    "build" = fetchgit {
+    build = fetchgit {
       url    = "${git_url}/chromium/src/build.git";
       rev    = "9338ce52d0b9bcef34c38285fbd5023b62739fac";
       sha256 = "1s2sa8dy3waidsirjylc82ggb18l1108bczjc8z0v4ywyj4k0cvh";
     };
-    "buildtools" = fetchgit {
+    buildtools = fetchgit {
       url    = "${git_url}/chromium/buildtools.git";
       rev    = "505de88083136eefd056e5ee4ca0f01fe9b33de8";
       sha256 = "0vj216nhb803bggsl0hnyagj8njrm96pn8sim6xcnqb7nhz1vabw";