80141: vbscript: Added Global_IsEmpty implementation

[buildbot at kegel.com]

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The Buildbot has detected a failed build on builder runtests-default while building Wine.
Full details are available at: http://buildbot.kegel.com/builders/runtests-default/builds/715 (though maybe not for long, as I'm still reinstalling the buildbot periodically while experimenting)
BUILD FAILED: failed shell_2

Errors:
global.c: In function 'Global_IsEmpty':
global.c:281:5: error: implicit declaration of function 'assert' [-Werror=implicit-function-declaration]
make[1]: *** [global.o] Error 1
make: *** [dlls/vbscript] Error 2
make: *** Waiting for unfinished jobs....