tinyscheme: don't require the gcc stdenv

pkgs/development/interpreters/tinyscheme/02-use-toolchain-env-vars.patch

···
+diff --git a/makefile b/makefile
+index aeb2fcd..4c111a1 100644
+--- a/makefile
++++ b/makefile
+@@ -18,7 +18,7 @@
+ #AR= echo
+ 
+ # Unix, generally
+-CC = gcc -fpic -pedantic
++CC := $(CC) -fpic -pedantic
+ DEBUG=-g -Wall -Wno-char-subscripts -O
+ Osuf=o
+ SOsuf=so
+@@ -27,10 +27,10 @@ EXE_EXT=
+ LIBPREFIX=lib
+ OUT = -o $@
+ RM= -rm -f
+-AR= ar crs
++AR := $(AR) crs
+ 
+ # Linux
+-LD = gcc
++LD := $(CC)
+ LDFLAGS = -shared
+ DEBUG=-g -Wno-char-subscripts -O
+ SYS_LIBS= -ldl -lm

pkgs/development/interpreters/tinyscheme/default.nix

···
-{ lib, stdenv, fetchurl }:
+{ lib, stdenv, fetchurl, dos2unix }:
 
 stdenv.mkDerivation rec {
   pname = "tinyscheme";
···
     sha256 = "sha256-F7Cxv/0i89SdWDPiKhILM5A50s/aC0bW/FHdLwG0B60=";
   };
 
-  patchPhase = ''
+  nativeBuildInputs = [ dos2unix ];
+
+  prePatch = "dos2unix makefile";
+  patches = [
+    # We want to have the makefile pick up $CC, etc. so that we don't have
+    # to unnecessarily tie this package to the GCC stdenv.
+    ./02-use-toolchain-env-vars.patch
+  ];
+  postPatch = ''
     substituteInPlace scheme.c --replace "init.scm" "$out/lib/init.scm"
   '';
 

pkgs/top-level/all-packages.nix

···
     wasi-libc = pkgsCross.wasi32.wasilibc;
   };
 
-  tinyscheme = callPackage ../development/interpreters/tinyscheme {
-    stdenv = gccStdenv;
-  };
+  tinyscheme = callPackage ../development/interpreters/tinyscheme { };
 
   bupc = callPackage ../development/compilers/bupc { };