treewide: use dontConfigure

pkgs/development/ocaml-modules/cryptgps/default.nix

@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ocaml findlib];
 
-  configurePhase = "true";	# Skip configure phase
+  dontConfigure = true;	# Skip configure phase
 
   createFindlibDestdir = true;
 

pkgs/development/ocaml-modules/expat/0.9.nix

@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
       --replace "gcc" "\$(CC)"
   '';
 
-  configurePhase = "true";  	# Skip configure
+  dontConfigure = true;  	# Skip configure
 
   buildPhase = ''
     make all allopt

pkgs/development/ocaml-modules/extlib/default.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation {
 
   createFindlibDestdir = true;
 
-  configurePhase = "true";      # Skip configure
+  dontConfigure = true;      # Skip configure
   # De facto, option minimal=1 seems to be the default.  See the README.
   buildPhase     = "make ${if minimal then "minimal=1" else ""} build";
   installPhase   = "make ${if minimal then "minimal=1" else ""} install";

pkgs/development/ocaml-modules/http/default.nix

@@ -23,7 +23,7 @@ stdenv.mkDerivation {
     substituteInPlace Makefile --replace "SHELL=/bin/bash" "SHELL=$BASH"
   '';
 
-  configurePhase = "true";	# Skip configure phase
+  dontConfigure = true;	# Skip configure phase
 
   buildPhase = ''
     make all opt

pkgs/development/ocaml-modules/pcre/default.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   createFindlibDestdir = true;
 
-  configurePhase = "true";	# Skip configure phase
+  dontConfigure = true;	# Skip configure phase
 
   meta = with stdenv.lib; {
     homepage = https://bitbucket.org/mmottl/pcre-ocaml;