fix: makefile in windows goos (#109)

Signed-off-by: Xinwei Xiong(cubxxw-openim) <3293172751nss@gmail.com>

Makefile

@@ -140,16 +140,25 @@ ifeq ($(origin GOBIN), undefined)
 	GOBIN := $(GOPATH)/bin
 endif
 
-COMMANDS ?= $(filter-out %.md, $(wildcard ${ROOT_DIR}/server/cmd/*))
-BINS ?= $(foreach cmd,${COMMANDS},$(notdir ${cmd}))
+ifeq ($(OS),Windows_NT)
+  NULL :=
+  SPACE := $(NULL) $(NULL)
+  ROOT_DIR := $(subst $(SPACE),\$(SPACE),$(shell cd))
+else
+  ROOT_DIR := $(shell pwd)
+endif
 
-ifeq (${COMMANDS},)
+COMMANDS := $(filter-out %.md, $(wildcard $(ROOT_DIR)/server/cmd/*))
+BINS := $(notdir $(COMMANDS))
+
+ifeq ($(strip $(COMMANDS)),)
   $(error Could not determine COMMANDS, set ROOT_DIR or run in source dir)
 endif
-ifeq (${BINS},)
+ifeq ($(strip $(BINS)),)
   $(error Could not determine BINS, set ROOT_DIR or run in source dir)
 endif
 
+
 EXCLUDE_TESTS=github.com/OpenIMSDK/OpenKF/test
 
 # ==============================================================================