ignore mkdir in windows ci

Author: hathach

.github/workflows/build_win_mac.yml

@@ -44,7 +44,7 @@ jobs:
     - name: Install ARM GCC
       uses: carlosperate/arm-none-eabi-gcc-action@v1
       with:
-        release: '10.3-2021.10'
+        release: '11.2-2022.02'
 
     - name: Checkout TinyUSB
       uses: actions/checkout@v3

examples/rules.mk

@@ -112,7 +112,7 @@ OBJ_DIRS = $(sort $(dir $(OBJ)))
 $(OBJ): | $(OBJ_DIRS)
 $(OBJ_DIRS):
 ifeq ($(CMDEXE),1)
-	@$(MKDIR) $(subst /,\,$@)
+	-@$(MKDIR) $(subst /,\,$@)
 else
 	@$(MKDIR) -p $@
 endif