treewide: Use targetPrefix instead of prefix for platform name prefixes

Certain tools, e.g. compilers, are customarily prefixed with the name of
their target platform so that multiple builds can be used at once
without clobbering each other on the PATH. I was using identifiers named
`prefix` for this purpose, but that conflicts with the standard use of
`prefix` to mean the directory where something is installed. To avoid
conflict and confusion, I renamed those to `targetPrefix`.

pkgs/development/tools/misc/binutils/default.nix

@@ -11,13 +11,13 @@ let
   version = "2.28.1";
   basename = "binutils-${version}";
   inherit (stdenv.lib) optional optionals optionalString;
-  # The prefix prepended to binary names to allow multiple binuntils on the
+  # The targetPrefix prepended to binary names to allow multiple binuntils on the
   # PATH to both be usable.
-  prefix = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-";
+  targetPrefix = optionalString (targetPlatform != hostPlatform) "${targetPlatform.config}-";
 in
 
 stdenv.mkDerivation rec {
-  name = prefix + basename;
+  name = targetPrefix + basename;
 
   src = fetchurl {
     url = "mirror://gnu/binutils/${basename}.tar.bz2";
@@ -81,7 +81,7 @@ stdenv.mkDerivation rec {
     then "-Wno-string-plus-int -Wno-deprecated-declarations"
     else "-static-libgcc";
 
-  # TODO(@Ericson2314): Always pass "--target" and always prefix.
+  # TODO(@Ericson2314): Always pass "--target" and always targetPrefix.
   configurePlatforms =
     # TODO(@Ericson2314): Figure out what's going wrong with Arm
     if hostPlatform == targetPlatform && targetPlatform.isArm
@@ -102,7 +102,7 @@ stdenv.mkDerivation rec {
   enableParallelBuilding = true;
 
   passthru = {
-    inherit prefix version;
+    inherit targetPrefix version;
   };
 
   meta = with stdenv.lib; {