mimalloc: fix one final time

The library link name is embedded in the ELF executable, so renaming the
file doesn't work. This patch just bites the bullet and writes two
separate code paths for the secure vs non-secure build...

Signed-off-by: Austin Seipp <aseipp@pobox.com>

pkgs/development/libraries/mimalloc/default.nix

@@ -1,5 +1,5 @@
 { stdenv, fetchFromGitHub, cmake, ninja
-, secureBuild ? true
+, secureBuild ? false
 }:
 
 let
@@ -25,17 +25,21 @@ stdenv.mkDerivation rec {
     mkdir -p $dev
     mv $out/lib/*/include $dev/include
 
-    # move everything else into place
-    mv $out/lib/mimalloc-1.0/libmimalloc*${soext}.1.0 $out/lib/libmimalloc${soext}
+    # move .a and .o files into place
     mv $out/lib/mimalloc-1.0/libmimalloc*.a           $out/lib/libmimalloc.a
     mv $out/lib/mimalloc-1.0/mimalloc*.o              $out/lib/mimalloc.o
 
+  '' + (if secureBuild then ''
+    mv $out/lib/mimalloc-1.0/libmimalloc-secure${soext}.1.0 $out/lib/libmimalloc-secure${soext}.1.0
+    ln -sfv $out/lib/libmimalloc-secure${soext}.1.0 $out/lib/libmimalloc-secure${soext}
+    ln -sfv $out/lib/libmimalloc-secure${soext}.1.0 $out/lib/libmimalloc${soext}
+  '' else ''
+    mv $out/lib/mimalloc-1.0/libmimalloc${soext}.1.0 $out/lib/libmimalloc${soext}.1.0
+    ln -sfv $out/lib/libmimalloc${soext}.1.0 $out/lib/libmimalloc${soext}
+  '') + ''
     # remote duplicate dir. FIXME: try to fix the .cmake file distribution
     # so we can re-use it for dependencies...
     rm -rf $out/lib/mimalloc-1.0
-  '' + stdenv.lib.optionalString secureBuild ''
-    # fix a broken symlink for the -secure alias
-    ln -sfv $out/lib/libmimalloc.so $out/lib/libmimalloc-secure.so
   '';
 
   outputs = [ "out" "dev" ];