treewide: remove redundant quotes

pkgs/development/compilers/swift/default.nix

@@ -35,7 +35,7 @@
 let
   v_base = "5.0.2";
   version = "${v_base}-RELEASE";
-  version_friendly = "${v_base}";
+  version_friendly = v_base;
 
   tag = "refs/tags/swift-${version}";
   fetch = { repo, sha256, fetchSubmodules ? false }:

pkgs/development/compilers/vlang/default.nix

@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   src = fetchFromGitHub {
     owner = "vlang";
     repo = "v";
-    rev = "${version}";
+    rev = version;
     sha256 = "0js92v2r1h4vaaha3z1spgi7qynlmr9vls41gxp284w4yhnjzv15";
   };
 
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
   vc = fetchFromGitHub {
     owner = "vlang";
     repo = "vc";
-    rev = "${version}";
+    rev = version;
     sha256 = "0qx1drs1hr94w7vaaq5w8mkq7j1d3biffnmxkyz63yv8573k03bj";
   };
 

pkgs/development/compilers/z88dk/default.nix

@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
   #_FORTIFY_SOURCE requires compiling with optimization (-O)
   NIX_CFLAGS_COMPILE = "-O";
 
-  short_rev = "${builtins.substring 0 7 src.rev}";
+  short_rev = builtins.substring 0 7 src.rev;
   makeFlags = [
     "git_rev=${short_rev}"
     "version=${version}"

pkgs/development/compilers/zulu/8.nix

@@ -65,7 +65,7 @@ in stdenv.mkDerivation {
   rpath = stdenv.lib.strings.makeLibraryPath libraries;
 
   passthru = {
-    home = "${zulu}";
+    home = zulu;
   };
 
   meta = with stdenv.lib; {

pkgs/development/compilers/zulu/default.nix

@@ -62,7 +62,7 @@ in stdenv.mkDerivation {
   rpath = stdenv.lib.strings.makeLibraryPath libraries;
 
   passthru = {
-    home = "${zulu}";
+    home = zulu;
   };
 
   meta = with stdenv.lib; {