*-wrapper; Switch from infixSalt to suffixSalt

I hate the thing too even though I made it, and rather just get rid of
it. But we can't do that yet. In the meantime, this brings us more
inline with autoconf and will make it slightly easier for me to write a
pkg-config wrapper, which we need.

pkgs/development/tools/build-managers/cmake/default.nix

@@ -63,8 +63,10 @@ stdenv.mkDerivation rec {
       --subst-var-by libc_lib ${lib.getLib stdenv.cc.libc}
     substituteInPlace Modules/FindCxxTest.cmake \
       --replace "$""{PYTHON_EXECUTABLE}" ${stdenv.shell}
-    # BUILD_CC and BUILD_CXX are used to bootstrap cmake
-    configureFlags="--parallel=''${NIX_BUILD_CORES:-1} CC=$BUILD_CC CXX=$BUILD_CXX $configureFlags"
+  ''
+  # CC_FOR_BUILD and CXX_FOR_BUILD are used to bootstrap cmake
+  + ''
+    configureFlags="--parallel=''${NIX_BUILD_CORES:-1} CC=$CC_FOR_BUILD CXX=$CXX_FOR_BUILD $configureFlags"
   '';
 
   configureFlags = [