qt4: delete parallel-build.patch to replace with a generic fix

pkgs/development/libraries/qt-4.x/4.8/default.nix

@@ -126,11 +126,6 @@ stdenv.mkDerivation rec {
     sed -i 's/QMAKE_CXX = g++/QMAKE_CXX = clang++/' mkspecs/common/g++-base.conf
   '';
 
-  postConfigure = ''
-    echo "applying patch ${./parallel-build.patch}"
-    patch -p1 < ${./parallel-build.patch}
-  '';
-
   prefixKey = "-prefix ";
 
   configureFlags =

pkgs/development/libraries/qt-4.x/4.8/parallel-build.patch

@@ -1,6 +0,0 @@
---- a/tools/designer/src/lib/Makefile
-+++ b/tools/designer/src/lib/Makefile
-@@ -7167,2 +7167,3 @@ compiler_moc_header_clean:
-                .uic/release-shared/ui_qtgradientviewdialog.h \
-+               .uic/release-shared/ui_qtgradientview.h \
-                ../../../shared/qtgradienteditor/qtgradientviewdialog.h

pkgs/tools/graphics/wkhtmltopdf/default.nix

@@ -21,7 +21,6 @@ stdenv.mkDerivation rec {
       rev    = "fe194f9dac0b515757392a18f7fc9527c91d45ab"; # From git submodule spec in wkhtml repo.
       sha256 = "1j2ld2bfacnn3vm2l1870v55sj82bq4y8zkawmlx2y5j63d8vr23";
     };
-    postConfigure = ""; # The patch "parallel-build.patch" does not apply.
     configureFlags =
       ''
         -dbus-linked