message: remove chmod for windows
diff: @@ -56,17 +56,17 @@ else ifneq ($(STANC_XATTR),)
  xattr -d com.apple.quarantine bin/stanc
  else ifneq (,$(wildcard bin/$(OS_TAG)-stanc))
  -# use release stanc3 binary (Linux & MacOS releases before Catalina)
  +# use release stanc3 binary (Windows, Linux & MacOS releases before Catalina)
  bin/stanc$(EXE) :
  cp bin/$(OS_TAG)-stanc bin/stanc$(EXE)
  +ifneq ($(OS_TAG),windows)
  chmod +x bin/stanc$(EXE)
  -
  +endif
  else ifeq ($(OS_TAG),windows)
  # get latest stanc3 - Windows
  bin/stanc$(EXE) :
  @mkdir -p $(dir $@)
  $(shell echo "curl -L https://github.com/stan-dev/stanc3/releases/download/nightly/$(OS_TAG)-stanc -o bin/stanc$(EXE) --retry $(STANC_DL_RETRY) --retry-delay $(STANC_DL_DELAY)")
  -
  else
  # get latest stanc3 - Linux & MacOS
  bin/stanc$(EXE) :
  