message: Windows fixes for wscript
  Use /MD, otherwise cquery will crash when trying to use C library.
  Fix build when symlink fails
diff: @@ -147,13 +147,16 @@ def configure(ctx):
  # /Zi: -g, /WX: -Werror, /W3: roughly -Wall, there is no -std=c++11 equivalent in MSVC.
  # /wd4722: ignores warning C4722 (destructor never returns) in loguru
  # /wd4267: ignores warning C4267 (conversion from 'size_t' to 'type'), roughly -Wno-sign-compare
  - msvcflags = ['/nologo', '/FS', '/EHsc', '/Zi', '/W3', '/WX', '/wd4996', '/wd4722', '/wd4267', '/wd4800']
  + # /MD: use multithread c library from DLL
  + msvcflags = ['/nologo', '/FS', '/EHsc', '/Zi', '/W3', '/WX', '/wd4996', '/wd4722', '/wd4267', '/wd4800', '/MD']
  +
  if ctx.options.variant == 'asan':
  cxxflags.append('-fsanitize=address,undefined')
  cxxflags.append('-O')
  ldflags.append('-fsanitize=address,undefined')
  elif ctx.options.variant == 'debug':
  - pass
  + msvcflags += ['/Zi', '/FS']
  + ldflags += ['/DEBUG']
  else:
  cxxflags.append('-O3')
  msvcflags.append('/O2') # There is no O3
  @@ -237,11 +240,13 @@ def configure(ctx):
  clang_dir = os.path.normpath('../../' + CLANG_TARBALL_NAME)
  try:
  os.symlink(clang_dir, bundled_clang_dir, target_is_directory=True)
  - except NotImplementedError:
  + except (OSError, NotImplementedError):
  # Copying the whole directory instead.
  - shutil.copytree(clang_dir, bundled_clang_dir)
  - except OSError:
  - pass
  + print ('shutil.copytree({0}, {1})'.format(os.path.join(out, CLANG_TARBALL_NAME), bundled_clang_dir))
  + try:
  + shutil.copytree(os.path.join(out, CLANG_TARBALL_NAME), bundled_clang_dir)
  + except Exception as e:
  + print('Failed to copy tree, ', e)
  clang_node = ctx.path.find_dir(bundled_clang_dir)
  ctx.check_cxx(uselib_store='clang',
  @@ -340,10 +345,8 @@ def build(bld):
  try:
  dst = os.path.join(bld.path.get_bld().abspath(), 'lib', name, 'bin', 'libclang.dll')
  os.symlink(dst, out_clang_dll)
  - except NotImplementedError:
  + except (OSError, NotImplementedError):
  shutil.copy(dst, out_clang_dll)
  - except OSError:
  - pass
  else:
  rpath = bld.env['LIBPATH_clang']
  