[AppVeyor] package_src before messing with path

appveyor.yml

@@ -50,9 +50,9 @@ install:
 
 build_script:
     - 'cd %APPVEYOR_BUILD_FOLDER%'
-    - 'set PATH=%PATH%;%APPVEYOR_BUILD_FOLDER%'
     - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win package_src || echo package_src failed"'
     - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win"'
+    - 'set PATH=%PATH%;%APPVEYOR_BUILD_FOLDER%'
     - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win tools"'
     - '%CYG_ROOT%/bin/bash -lc "cd \"$OLDPWD\" && make -s -f Makefile.win package_bin"'
     - dir %APPVEYOR_BUILD_FOLDER%\out