Revert "db4: fix configure with llvm"

the configure program fails to compile due to using exit without a
function prototype. the fix should be to patch the configure script.

This reverts commit 227afde6d8.

pkgs/development/libraries/db/db-4.8.nix

@@ -1,6 +1,6 @@
-{ lib, stdenv, fetchurl, autoreconfHook, targetPlatform, ... } @ args:
+{ lib, stdenv, fetchurl, autoreconfHook, ... } @ args:
 
-import ./generic.nix (builtins.removeAttrs args ["targetPlatform"] // {
+import ./generic.nix (args // {
   version = "4.8.30";
   sha256 = "0ampbl2f0hb1nix195kz1syrqqxpmvnvnfvphambj7xjrl3iljg0";
   extraPatches = [
@@ -9,8 +9,6 @@ import ./generic.nix (builtins.removeAttrs args ["targetPlatform"] // {
     ./darwin-mutexes-4.8.patch
   ];
 
-  drvArgs.configureFlags = lib.optional (targetPlatform.useLLVM or false) "--with-mutex=POSIX/pthreads";
-
   drvArgs.hardeningDisable = [ "format" ];
   drvArgs.doCheck = false;
 })

pkgs/development/libraries/db/generic.nix

@@ -67,8 +67,7 @@ stdenv.mkDerivation (rec {
       (if compat185 then "--enable-compat185" else "--disable-compat185")
     ]
     ++ lib.optional dbmSupport "--enable-dbm"
-    ++ lib.optional stdenv.isFreeBSD "--with-pic"
-    ++ (drvArgs.configureFlags or []);
+    ++ lib.optional stdenv.isFreeBSD "--with-pic";
 
   preConfigure = ''
     cd build_unix
@@ -93,4 +92,4 @@ stdenv.mkDerivation (rec {
     license = license;
     platforms = platforms.unix;
   };
-} // builtins.removeAttrs drvArgs [ "configureFlags" ])
+} // drvArgs)