qt58.qtbase: replace mkspecs patch with sed script

pkgs/development/libraries/qt-5/5.8/qtbase/default.nix

@@ -39,8 +39,7 @@ stdenv.mkDerivation {
   patches =
     copyPathsToStore (lib.readPathsFromFile ./. ./series)
     ++ [(if stdenv.isDarwin then ./cmake-paths-darwin.patch else ./cmake-paths.patch)]
-    ++ lib.optional decryptSslTraffic ./decrypt-ssl-traffic.patch
+    ++ lib.optional decryptSslTraffic ./decrypt-ssl-traffic.patch;
-    ++ lib.optionals mesaSupported [ ./mkspecs-libgl.patch ];
 
   postPatch =
     ''
@@ -53,11 +52,14 @@ stdenv.mkDerivation {
       sed -i 's/NO_DEFAULT_PATH//' "src/gui/Qt5GuiConfigExtras.cmake.in"
       sed -i 's/PATHS.*NO_DEFAULT_PATH//' "mkspecs/features/data/cmake/Qt5BasicConfig.cmake.in"
     ''
+
     + lib.optionalString mesaSupported ''
-      substituteInPlace mkspecs/common/linux.conf \
+      sed -i mkspecs/common/linux.conf \
-        --replace "@mesa_lib@" "${mesa.out}" \
+          -e "/^QMAKE_INCDIR_OPENGL/ s|$|${mesa.dev or mesa}/include|" \
-        --replace "@mesa_inc@" "${mesa.dev or mesa}"
+          -e "/^QMAKE_LIBDIR_OPENGL/ s|$|${mesa.out}/lib|"
-    ''+ lib.optionalString stdenv.isDarwin ''
+    ''
+
+    + lib.optionalString stdenv.isDarwin ''
       sed -i \
           -e 's|! /usr/bin/xcode-select --print-path >/dev/null 2>&1;|false;|' \
           -e 's|! /usr/bin/xcrun -find xcodebuild >/dev/null 2>&1;|false;|' \

pkgs/development/libraries/qt-5/5.8/qtbase/mkspecs-libgl.patch

@@ -1,15 +0,0 @@
-Index: qtbase-opensource-src-5.5.1/mkspecs/common/linux.conf
-===================================================================
---- qtbase-opensource-src-5.5.1.orig/mkspecs/common/linux.conf
-+++ qtbase-opensource-src-5.5.1/mkspecs/common/linux.conf
-@@ -12,8 +12,8 @@ QMAKE_INCDIR            =
- QMAKE_LIBDIR            =
- QMAKE_INCDIR_X11        =
- QMAKE_LIBDIR_X11        =
--QMAKE_INCDIR_OPENGL     =
--QMAKE_LIBDIR_OPENGL     =
-+QMAKE_INCDIR_OPENGL     = @mesa_inc@/include
-+QMAKE_LIBDIR_OPENGL     = @mesa_lib@/lib
- QMAKE_INCDIR_OPENGL_ES2 = $$QMAKE_INCDIR_OPENGL
- QMAKE_LIBDIR_OPENGL_ES2 = $$QMAKE_LIBDIR_OPENGL
- QMAKE_INCDIR_EGL        =