Utilities/Release: Skip spurious Qt5Autogen test for nightly win64 binary

This test fails spuriously too often and prevents the nightly binary
from finishing.  Simply skip it for the nightly binary to allow it
to complete more regularly.

Utilities/Release/win64_release.cmake

@@ -26,4 +26,8 @@ set(CXXFLAGS "${ppflags}")
 set(ENV ". ~/rel/env64")
 get_filename_component(path "${CMAKE_CURRENT_LIST_FILE}" PATH)
 set(GIT_EXTRA "git config core.autocrlf true")
+if(CMAKE_CREATE_VERSION STREQUAL "nightly")
+  # Some tests fail spuriously too often.
+  set(EXTRA_CTEST_ARGS "-E Qt5Autogen")
+endif()
 include(${path}/release_cmake.cmake)