fixed smart-env.bat on win10

smart-env.bat

@@ -9,19 +9,19 @@
     @set RTT_CC=gcc
     @set RTT_EXEC_PATH=%cd%\tools\gnu_gcc\arm-linux-musleabi_for_i686-w64-mingw32\bin
     @set RTT_CC_PREFIX=arm-linux-musleabi-
-    @set PATH=%RTT_EXEC_PATH%;%PATH%
     @copy configs\def_config_arm .config
 ) else if %def_arch%==riscv64 (
     @set RTT_CC=gcc
     @set RTT_EXEC_PATH=%cd%\tools\gnu_gcc\riscv64-linux-musleabi_for_i686-w64-mingw32\bin
     @set RTT_CC_PREFIX=riscv64-unknown-linux-musl-
-    @set PATH=%RTT_EXEC_PATH%;%PATH%
     @copy configs\def_config_riscv64 .config
 ) else (
     @echo "ERROR:supported_arch=arm riscv64!"
     @goto EXIT
 )
 
+@set PATH=%RTT_EXEC_PATH%;%PATH%
+
 @echo "Arch      => %def_arch%"
 @echo "CC        => %RTT_CC%"
 @echo "PREFIX    => %RTT_CC_PREFIX%"