qt5.qtwebengine: remove dead conditions for pre 5.12 support

This doesn't change the derivation.

pkgs/development/libraries/qt-5/modules/qtwebengine.nix

@@ -1,5 +1,5 @@
-{ qtModule, qtCompatVersion,
-  qtdeclarative, qtquickcontrols, qtlocation, qtwebchannel
+{ qtModule
+, qtdeclarative, qtquickcontrols, qtlocation, qtwebchannel
 
 , bison, coreutils, flex, git, gperf, ninja, pkgconfig, python2, which
 
@@ -54,14 +54,6 @@ qtModule {
     ''
       ( cd src/3rdparty/chromium; patchShebangs . )
     ''
-    # Patch Chromium build files
-    + optionalString (lib.versionOlder qtCompatVersion "5.12") ''
-      substituteInPlace ./src/3rdparty/chromium/build/common.gypi --replace /bin/echo ${coreutils}/bin/echo
-      substituteInPlace ./src/3rdparty/chromium/v8/gypfiles/toolchain.gypi \
-        --replace /bin/echo ${coreutils}/bin/echo
-      substituteInPlace ./src/3rdparty/chromium/v8/gypfiles/standalone.gypi \
-        --replace /bin/echo ${coreutils}/bin/echo
-    ''
     # Prevent Chromium build script from making the path to `clang` relative to
     # the build directory.  `clang_base_path` is the value of `QMAKE_CLANG_DIR`
     # from `src/core/config/mac_osx.pri`.
@@ -91,10 +83,10 @@ qtModule {
     ''
      # Following is required to prevent a build error:
      # ninja: error: '/nix/store/z8z04p0ph48w22rqzx7ql67gy8cyvidi-SDKs/MacOSX10.12.sdk/usr/include/mach/exc.defs', needed by 'gen/third_party/crashpad/crashpad/util/mach/excUser.c', missing and no known rule to make it
-    + (optionalString (lib.versionAtLeast qtCompatVersion "5.11") ''
+    + ''
       substituteInPlace src/3rdparty/chromium/third_party/crashpad/crashpad/util/BUILD.gn \
         --replace '$sysroot/usr' "${darwin.xnu}"
-    '')
+    ''
     + ''
     # Apple has some secret stuff they don't share with OpenBSM
     substituteInPlace src/3rdparty/chromium/base/mac/mach_port_broker.mm \